Sodium Hydroxide Solution
Sodium Hydroxide Solution - Related Videos
02:39
Enthalpy of Solution
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2020
There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution: A decrease in the internal energy of the system (an exothermic change, as discussed in the previous chapter on thermochemistry) An increased dispersal of matter in the system (which indicates an increase in the entropy of the system, as you will learn about in the later chapter on thermodynamics) In the process of dissolution, an internal energy change often, but not always, occurs as heat is...
02:45
Calculating pH Changes in a Buffer Solution
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2020
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
03:22
Strong Acid and Base Solutions
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2020
A strong acid is a compound that dissociates completely in an aqueous solution and produces a concentration of hydronium ions equal to the initial concentration of acid. For example, 0.20 M hydrobromic acid will dissociate completely in water and produces 0.20 M of hydronium ions and 0.20 M of bromide ions. On the other hand, a strong base is a compound that dissociates completely in an aqueous solution and produces hydroxide ions. For example, 0.015 M KOH, a group 1 metal hydroxide, will...
04:08
Determining the pH of Salt Solutions
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2020
The pH of a salt solution is determined by its component anions and cations. Salts that contain pH-neutral anions and the hydronium ion-producing cations form a solution with a pH less than 7. For example, in ammonium nitrate (NH4NO3) solution, NO3− ions do not react with water whereas NH4+ ions produce the hydronium ions resulting in the acidic solution. In contrast, salts that contain pH-neutral cations and the hydroxide ion-producing anions form a solution with a pH greater than 7. For...
07:27
Making Solutions in the Laboratory
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2023
The ability to successfully make solutions is a basic laboratory skill performed in virtually all biological and chemical experiments. A solution is a homogenous mixture of solute dissolved in bulk liquid known as the solvent. Solutions can be described by their solute concentration, a measure of how much solute is present per unit of solution. In this video, a step-by-step procedure for how to make a water-based, or aqueous, solution for biological applications is presented. The video...
FAQs
Hydroxide ions create the high-pH conditions that drive the solution’s biological effects. This alkaline environment can disrupt cell membranes, denature proteins, and hydrolyze susceptible chemical bonds. Because these effects depend on exposure to a strongly basic medium, controlling the treatment helps researchers alter cellular material while supporting a targeted laboratory workflow rather than causing uncontrolled chemical damage.
Protein denaturation changes the structure of cellular proteins during alkaline treatment. Membrane disruption also helps expose or release intracellular contents, while bond hydrolysis affects molecules that are chemically susceptible under alkaline conditions. Together, these effects explain why sodium hydroxide solution can function as a chemical treatment in biological sample processing and help release plasmid DNA from bacterial cells.
After alkaline treatment, neutralization allows plasmid DNA to renature, whereas much cellular debris and denatured material precipitate. This difference in behavior provides the basis for separating the desired plasmid fraction from unwanted bacterial components before purification. The contrasting responses to alkaline conditions and neutralization therefore make pH control central to the workflow’s selectivity.
Neutralization changes the strongly alkaline conditions so that plasmid DNA can renature. At the same stage, much cellular debris and denatured material precipitate, helping separate these contaminants from the plasmid-containing fraction. Thus, neutralization is not merely a pH adjustment; it creates the transition that supports plasmid DNA recovery and subsequent purification.
The solution is used during the treatment phase, when bacterial cells are chemically disrupted to help release plasmid DNA. Neutralization follows, allowing the plasmid DNA to renature while much cellular debris and denatured material precipitate. Purification then uses this changed mixture to support recovery of plasmid DNA for later molecular cloning or genetic analysis.
Recovered plasmid DNA can support molecular cloning and other genetic analyses. The value of the method lies in converting a mixed bacterial sample into material that is more suitable for purification and downstream study. In this context, sodium hydroxide solution is part of a broader preparation strategy that links controlled pH treatment with experimental access to plasmid DNA.