Name: strong acids, strong bases, and ph
Uploaded: 2020-09-24T15:06:51.000Z
Duration: 3 min 22 s
Channel: JoVE

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North Carolina K-12 Science Standard Course of Study

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Chemistry

Matter and its Interactions

PS.Chm.6.3

Strong Acid and Base Solutions

Gli acidi forti si dissociano completamente nell'acqua. Per esempio, l'acido nitrico si dissocia completamente in ioni idronio e ioni nitrato. Poiché gli ioni idronio generati dall'autoionizzazione dell'acqua sono trascurabili, la concentrazione degli ioni idronio nell'acqua è uguale alla concentrazione dell'acido forte.

Il pH di queste soluzioni può essere determinato utilizzando la concentrazione iniziale dell'acido forte. Per esempio, in una soluzione molare di HCl 0, 10, HCl si dissocerà completamente negli ioni idronio e ioni cloruro, e quindi anche la concentrazione di ioni idronio della soluzione sarà 0, 10 molare. Prendendo il log negativo di questa concentrazione, il pH della soluzione è uguale a uno.

Al contrario, il pH di una soluzione può essere utilizzato per determinare la concentrazione degli ioni idronio di una soluzione. Per esempio, per una soluzione a pH 3, 60, la sua concentrazione di ioni idronio può essere determinata risolvendo l'equazione 3, 60 è uguale al log negativo della concentrazione di ioni idronio. Per risolvere la concentrazione, moltiplicate entrambi i lati per uno negativo, quindi prendete l'antilogrammo di entrambi i lati.

La concentrazione di ioni idronio è pari a 2, 5 10⁻⁴ molare. Le basi forti, idrossidi metallici del gruppo uno, come l'idrossido di sodio e l'idrossido di potassio, si dissociano completamente nelle soluzioni. Per esempio, l'idrossido di sodio molare 0, 20 si dissocerà completamente in acqua e produrrà ioni di sodio molari 0, 20 e ioni idrossido molari 0, 20.

Tuttavia, gli idrossidi metallici del gruppo due, come l'idrossido di bario e l'idrossido di calcio, producono due moli di ioni idrossido per ogni mole di base. Per esempio, 0, 020 di idrossido di calcio molare si dissocerà completamente in acqua e produrrà 0, 020 ioni calcio molari e 0, 040 ioni idrossido molare. Anche gli ossidi metallici ionici, come l'ossido di sodio e quello di calcio, sono basi forti.

Il loro ione ossido reagisce con l'acqua e produce ioni idrossido. La concentrazione di ioni idrossido, può essere usata per calcolare un pOH e il pH della soluzione. Per esempio, una soluzione di idrossido di potassio molare 5 10⁻⁵ ha una quantità uguale di ioni idrossido come base forte e quindi ha un pOH di 4, 30.

Come il pH, anche un pOH della soluzione può essere usato per determinare la concentrazione di ioni idrossido risolvendo l'equazione:pOH è uguale al log negativo della concentrazione di ioni idrossido. Poiché il pH più pOH è uguale a 14 e il pOH è 4, 3, il pH della soluzione è 9, 7.

soluzioni di acidi e basi forti

Un acido forte è un composto che si dissocia completamente in una soluzione acquosa e produce una concentrazione di ioni idronio pari alla concentrazione iniziale dell'acido. Ad esempio, l'acido bromidrico 0,20 M si dissocerà completamente in acqua e produrrà 0,20 M di ioni idronio e 0,20 M di ioni bromuro.

<img alt="Eq1" src="/files/ftp_upload/11399/11399_Equation_1.png" style="height: 50px;" />

D'altra parte, una base forte è un composto che si dissocia completamente in una soluzione acquosa e produce ioni idrossido. Ad esempio, 0,015 M KOH, un idrossido metallico del gruppo 1, si dissocerà completamente e produrrà 0,015 M di OH- e 0,015 M di K+.

<img alt="Eq2" src="/files/ftp_upload/11399/11399_Equation_2.png" style="height: 50px;" />

Anche gli idrossidi metallici del gruppo 2, come l'idrossido di bario [Ba(OH)2] e l'idrossido di stronzio [Sr(OH)2], sono basi forti e possiedono due ioni idrossido. Ciò fa sì che producano una soluzione più basica rispetto a NaOH o KOH alla stessa concentrazione. Ad esempio, 0,015 M Ba(OH)2 produce 0,015 M Ba+ e 0,030 M idrossido.

<img alt="Eq3" src="/files/ftp_upload/11399/11399_Equation_3.png" style="height: 50px;" />

Poiché gli acidi e le basi forti si dissociano completamente, i rapporti molari possono essere utilizzati per determinare le loro concentrazioni di idronio e idrossido, che a loro volta possono essere utilizzate per calcolare il pH o il pOH di una soluzione. Ad esempio, una soluzione di HCl 0,030 M produrrà ioni idronio 0,03 M. Pertanto il pH di questa soluzione sarà

<img alt="Eq4" src="/files/ftp_upload/11399/11399_Equation_4.png" style="height: 135px;" />

Il pOH della stessa soluzione può essere determinato utilizzando la formula

<img alt="Eq5" src="/files/ftp_upload/11399/11399_Equation_5.png" style="height: 50px;" />

Poiché il pH della soluzione è 1,52, il suo pOH può essere calcolato come

<img alt="Eq6" src="/files/ftp_upload/11399/11399_Equation_6.png" style="height: 50px;" />

Allo stesso modo, la concentrazione di ioni idrossido prodotti da basi forti può essere utilizzata per determinare il pOH di una soluzione utilizzando l'equazione

<img alt="Eq7" src="/files/ftp_upload/11399/11399_Equation_7.png" style="height: 50px;" />

L'equazione di cui sopra può essere utilizzata anche per determinare la concentrazione di ioni idrossido quando è noto il pOH. Ad esempio, se il pOH di una soluzione è 3,00,

<img alt="Eq8" src="/files/ftp_upload/11399/11399_Equation_8.png" style="height: 50px;" />

La moltiplicazione di entrambi i membri per −1 dà

<img alt="Eq9" src="/files/ftp_upload/11399/11399_Equation_9.png" style="height: 50px;" />

Ora prendi l'antilogaritmo di entrambi i membri

<img alt="Eq10" src="/files/ftp_upload/11399/11399_Equation_10.png" style="height: 90px;" />

Pertanto, la concentrazione di ioni idronio della soluzione con pOH 3 è 1,0 × 10−3 M. Un metodo simile può essere utilizzato per determinare la concentrazione di ioni idronio di una soluzione se si conosce il suo pH.

Soluzioni di acidi e basi forti

Un acido forte è un composto che si dissocia completamente in una soluzione acquosa e produce una concentrazione di ioni idronio pari al ...

Education

Didattica

JoVE Core

Chimica

Acids and Bases

Acidi e Basi

KEY TERMS AND CONCEPTS

TERMINI E CONCETTI CHIAVE

strong acids, strong bases, and ph

Strong acids and strong bases change the pH of a solution by dissociating completely in water. A strong acid produces hydronium ions, which are H3O+ ions, and a strong base produces hydroxide ions, OH-. Because the dissociation is complete, the ion concentration can be found from the starting concentration and the molar ratio.

For example, 0.20 M hydrobromic acid dissociates fully in water. It produces 0.20 M hydronium ions and 0.20 M bromide ions. A 0.015 M KOH solution also dissociates completely. It produces 0.015 M OH- and 0.015 M K+.

Some group 2 metal hydroxides are also strong bases. Barium hydroxide, Ba(OH)2, and strontium hydroxide, Sr(OH)2, each contain two hydroxide ions. That means they create a more basic solution than NaOH or KOH at the same concentration. For example, 0.015 M Ba(OH)2 produces 0.015 M Ba+ and 0.030 M hydroxide.

The ion concentrations from strong acids and strong bases can be used to calculate pH and pOH. A 0.030 M HCl solution produces 0.03 M hydronium ions, so its pH can be found from that concentration. The same pH value can then be used to determine pOH. If the pH is 1.52, the pOH can be calculated from the relationship between them.

The same idea works for strong bases. The hydroxide ion concentration can be used to find pOH with the equation for pOH, and the equation can also be used in reverse when pOH is known. For example, if the pOH of a solution is 3.00, multiplying by -1 and taking the antilog gives a hydronium ion concentration of 1.0 × 10^-3 M. The same method can be used to find hydronium ion concentration when pH is known.

Strong Acids, Strong Bases, and pH

bronsted-lowry acids and bases

Proton Transfer in Acids and Bases

Acids and bases can be understood through proton transfer. Early scientists described acids by their sour taste, their effect on dyes, and their reaction with limestone, which releases carbon dioxide. Robert Boyle also noted that acid solutions can lose these properties after contact with alkali, or base, solutions. The modern view developed step by step. Humphry Davy showed that hydrogen is the essential part of acids. Joseph Louis Gay-Lussac then described acids as substances that neutralize...

water: a bronsted-lowry acid and base

Water as an Amphiprotic Substance

Water can act as both a Brønsted-Lowry acid and a Brønsted-Lowry base. When hydrogen fluoride dissolves in water, it donates protons to water. This is acid ionization. The products are hydronium ions and fluoride ions. Water can also accept protons from another substance. When pyridine dissolves in water, it accepts a proton from water molecules. This is base ionization. The products are hydroxide ions and pyridinium ions. These reactions show that water can play either role. A substance that...

ph scale

pH and pOH in Water

pH and pOH show how hydronium and hydroxide ions behave in water and other aqueous solutions. These ion concentrations are linked by the ion product of water, K w , so when one goes up, the other goes down. Because ion concentrations can differ by huge amounts, a logarithmic scale is used to describe them. pH is defined from the hydronium ion concentration, [H3O+], and pOH is the matching p-function for hydroxide ion concentration. These two values are also connected through the K w...

relative strengths of conjugate acid-base pairs

relative-strengths-of-conjugate-acid-base-pairs

How Ka and Kb Show Acid-Base Strength

Brønsted-Lowry acid-base chemistry is based on proton transfer. That idea helps show how the strength of an acid is linked to the strength of its conjugate base, and vice versa. Acid and base strength is measured with ionization constants, Ka and Kb, which tell how far an ionization reaction goes. For the conjugate pair HA and A−, the acid ionizes in water and the base reaction can be written for the partner species. When the two reactions are added, they give the autoionization of water. The...

strong acid and base solutions

Strong acids and strong bases change the pH of a solution by dissociating completely in water. A strong acid produces hydronium ions, which are H3O+ ions, and a strong base produces hydroxide ions, OH-. Because the dissociation is complete, the ion concentration can be found from the starting concentration and the molar ratio. For example, 0.20 M hydrobromic acid dissociates fully in water. It produces 0.20 M hydronium ions and 0.20 M bromide ions. A 0.015 M KOH solution also dissociates...

weak acid solutions

Weak Acid Equilibrium in Water

Weak acid equilibrium in water explains why many acids only partially react when dissolved. Most weak acid molecules stay in their original form, and only a small amount of hydronium ions forms. Weak acids are common in nature. They help create the tangy taste of citrus fruits, the stinging sensation from insect bites, and the smells linked to body odor. Acetic acid is a familiar weak acid. It is the main ingredient in vinegar. Its equation uses a double arrow to show that the reaction with...

weak base solutions

Weak Base pH and Kb Calculations

Weak base pH and Kb calculations show how partially reacting bases change water chemistry. Weak bases produce hydroxide ions when they dissolve by reacting with water molecules. Because the reaction only happens partly, these compounds are classified as weak bases. Weak bases are common in nature and in technology. Ammonia is one major example. Global production of ammonia is typically well over 100 metric tons each year. It is used as an agricultural fertilizer, a starting material for...

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pH of Acid Mixtures

The pH of acid mixtures depends on the acids present, their dissociation constants, and their starting concentrations. When a solution contains two different acids, the pH can be found by choosing the method that fits their relative strengths. This makes acid mixtures a useful case for applying acid-base rules in chemistry. In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and supplies almost all of the hydronium ions in the solution. The weak acid...

ions as acids and bases

Salt Hydrolysis and pH of Solutions

Salt hydrolysis explains why some salt solutions are acidic, basic, or neutral. Salts are ionic compounds made of cations and anions. In water, either ion may react with water through an acid or base ionization reaction. The pH of the solution depends on the relative acid-base strength of the ions in the salt. Ammonium chloride is a good example of an acidic salt. When it dissolves, it separates into ammonium ions and chloride ions. The ammonium ion is the conjugate acid of ammonia, so it can...

determining the ph of salt solutions

Salt Hydrolysis and pH in Solutions

Salt hydrolysis and pH in solutions depend on the ions released when a salt dissolves. Some ions react with water, while others do not. The balance between the cation and anion helps show whether the solution becomes acidic, basic, or neutral. Salts with pH-neutral anions and cations that produce hydronium ions give acidic solutions with pH below 7. Ammonium nitrate is one example. In NH4NO3, NO3− does not react with water, but NH4+ forms hydronium ions, so the solution is acidic. Other salts...

acid/base strengths and dissociation constants

acidbase-strengths-and-dissociation-constants

Acid and Base Strength in Water

Acid and base strength in water depends on how much a substance ionizes after it dissolves. If ionization is nearly complete, the substance is called strong. If only a small amount ionizes, it is called weak. Weak acids and weak bases are much more common than strong ones. The most common strong acids are HClO4, HCl, HBr, HI, HNO3, and H2SO4. The most common strong bases are LiOH, NaOH, KOH, Ca(OH)2, Sr(OH)2, and Ba(OH)2. These strong acids and bases ionize essentially completely in water. <br...

polyprotic acids

Stepwise Ionization of Polyprotic Acids

Polyprotic acids lose hydrogen ions in steps. The number of ionizable protons in a molecule determines whether an acid is monoprotic, diprotic, or triprotic. This video also shows that polyprotic bases can accept more than one proton. Monoprotic acids have one ionizable hydrogen atom per molecule. Examples include HCl, HNO3, and HCN. Their reactions with water form hydronium ions and the matching anion. Acetic acid, CH3CO2H, is also monoprotic because only the hydrogen in the carboxyl group...

acid strength and molecular structure

How Bonding Affects Acid Strength

Acid strength depends on bonding, electronegativity, and oxidation number. These factors help explain why some hydrogen compounds act as strong acids, while others behave as weak acids or bases. For binary acids, which are hydrogen compounds with one other nonmetal, acidity increases as the H-A bond gets weaker down a group. That is why the order for group 17 is HF &lt; HCl &lt; HBr &lt; HI, and for group 16 it is H2O &lt; H2S &lt; H2Se &lt; H2Te. Across a period, acid strength increases as...

lewis acids and bases

Electron-Pair Reactions in Acid-Base Chemistry

Electron-pair reactions explain Lewis acid-base chemistry. In 1923, G. N. Lewis described acids and bases by how they accept or donate a pair of electrons. When that electron pair forms a coordinate covalent bond, one atom supplies both bonding electrons. This bond is also called a dative bond. A simple example is the reaction of water with a hydrogen ion to make a hydronium ion. Ammonia can also combine with a hydrogen ion to form an ammonium ion. In both cases, the reaction creates a Lewis...

key terms and concepts

Learn how strong acids and strong bases dissociate completely in water and how their ion concentrations are used to calculate pH and pOH.

Strong Acids, Strong Bases, and pH | JoVE K12

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JoVE Core: Chimica illustra concetti chiave di chimica attraverso video animazioni concise e di immediata comprensione. Inoltre, i video della sezione "scienziati in azione" mostrano procedure metodologiche realizzate da ricercatori provenienti dai migliori laboratori internazionali.

Physical Science

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Ohio’s Learning Standards and Model Curriculum

Interactions Of Matter

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Minnesota Academic Standards in Science

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Matter and Its Interactions

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New York State Science Learning Standards

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Strong Acids, Strong Bases, and pH

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