Name: bomb calorimeter heat measurement
Uploaded: 2020-09-03T13:38:27.000Z
Duration: 2 min 41 s
Channel: JoVE

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Chemistry

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PS.Chm.7.2

Constant Volume Calorimetry

Die Veränderung der inneren Energie einer Reaktion, delta E, ist die Summe der beiden Größen Wärme, q, und Arbeit, w. Während es einfach ist, Wärme durch Temperaturänderungen zu messen, ist die Messung der durch Druck verursachte Volumenarbeit durch Volumenänderungen schwierig. Bei gasförmigen chemischen Reaktionen, wenn das Volumen nicht geändert werden darf, ist Delta V gleich Null, und folglich wird auch w gleich Null sein.Somit entspricht die innere Energieänderung der Reaktion genau der übertragenen Wärme. Unter konstanten Volumenbedingungen, wird die in einer Reaktion übertragene Wärme mit einem Bombenkalorimeter gemessen. Dies unterscheidet sich von einem Kaffeetassen-Kalorimeter, welches die Wärme einer Reaktion unter konstantem Druck Bedingungen misst.In einem Bombenkalorimeter wurden 0, 512 Gramm Naphthalin in einer Bombe aus rostfreiem Stahl platziert. Durch einen Einlass wird die Zündspule mit der Probe in Kontakt gebracht. Die Bombe wird dann mit Sauerstoff gefüllt und in einen isolierten Behälter eingetaucht, der mit einer bekannten Wassermasse gefüllt ist.Elektrisches Zünden des Reaktanten löst die Verbrennungsreaktion im Inneren der Bombe aus. Die freigesetzte Wärme wird vom Wasser absorbiert und die verschiedenen Komponenten des Kalorimeters, die alle zusammen, die Umgebung bilden. Dadurch steigt die Temperatur um 6, 42 Grad Celsius.Die von den gesamten Kalorimeter-Bestandteilen absorbierte Wärme, q cal, ist gleich seiner Wärmekapazität, C cal, multipliziert mit der Temperaturänderung, delta T.Wenn der experimentell bestimmte Wert für C cal 3, 20 Kilojoule/Grad Celsius beträgt, ersetzt man dann diese, zusammen mit dem Wert für delta T, ergibt sich die Wärme des Kalorimeters von 20, 5 Kilojoule. Die durch das Kalorimeter gewonnene Wärme entspricht genau der durch die Reaktion freigesetzten Wärme. Die Bombe wird versiegelt, die Reaktion erfolgt bei konstantem Volumen, und die geleistete Arbeit ist Null.Die Wärme der Reaktion ist also gleich ihrer inneren Energieveränderung, Negativwert von 20, 5 Kilojoule. Dividieren Sie diesen Wert durch die Molzahl die in 0, 512 Gramm Naphthalin enthalten ist 3, 99 mal 10 zu den negativen 3 Molen gibt die Veränderung der inneren Energie pro Mol Naphthalin an, was einem Negativwert von 5140 Kilojoule/mol entspricht.

<ol>
	<li>Hornyak, Frederick M. "Ein Blitzlampenbombenkalorimeter." Zeitschrift für chemische Bildung 38, Nr. 2 (1961): 97.</li>
	<li>Watkins, Geo B. "Gesamtkohlenstoff in Kohle bestimmt durch Analyse des Gases aus dem Bombenkalorimeter." Industrial & Engineering Chemistry 19, Nr. 9 (1927): 1052-1054.</li>
	<li>Olney, David J. "Simulation von Bombenkalorimetern." (1990): 922. 
	 </li>
</ol>

kalorimetrie bei konstantem volumen

Kalorimeter eignen sich zur Bestimmung der bei einer chemischen Reaktion freigesetzten oder aufgenommenen Wärme. Kaffeetassen-Kalorimeter sind für den Betrieb bei konstantem (atmosphärischem) Druck ausgelegt und eignen sich zur Messung des Wärmeflusses (oder der Enthalpieänderung), welche bei Prozessen auftreten die in Lösung bei konstantem Druck ablaufen. Eine andere Art von Kalorimeter, welches bei konstantem Volumen arbeitet und umgangssprachlich als Bombenkalorimeter bekannt ist, wird zur Messung der Energie verwendet, die durch Reaktionen erzeugt wird, die große Mengen an Wärme und gasförmigen Produkten erzeugen, wie z. B. Verbrennungsreaktionen. (Der Begriff „Bombe“ geht auf die Beobachtung zurück, dass diese Reaktionen heftig genug sein können um Explosionen zu ähneln, die andere Kalorimeter beschädigen würden.) Laut dem ersten Hauptsatz der Thermodynamik ist die Änderung der inneren Energie (ΔE) einer Reaktion die Summe aus Wärme (q) und Arbeit (w). <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-01.png" style="height: 40px;"> Bei Gasreaktionen ist die verrichtete Arbeit vom Druck und Volumen abhängig, was zu Änderungen des Reaktionsvolumens führt. <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-02.png" style="height: 40px;"> Bombenkalorimeter sind für den Betrieb bei konstantem Volumen ausgelegt, sodass sich das Reaktionsvolumen nicht ändert (ΔV = 0). <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-03.png" style="height: 40px;"> Daher ist die geleistete Arbeit gleich Null und die mit einem Bombenkalorimeter gemessene Wärme (q_v) entspricht der Änderung der inneren Energie der Reaktion. <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-04.png" style="height: 40px;"> Ein Bombenkalorimeter besteht aus einem robusten Stahlbehälter, der die Reaktanten enthält und selbst in Wasser getaucht ist. Die Probe wird in die Bombe gegeben, die dann unter hohem Druck mit Sauerstoff gefüllt wird. Zur Zündung der Probe wird ein kleiner elektrischer Funke verwendet. Die durch die Reaktion erzeugte Energie wird von der Stahlbombe und dem umgebenden Wasser absorbiert. Der Temperaturanstieg (ΔT) wird gemessen und zusammen mit der bekannten Wärmekapazität des Kalorimeters (C_cal) zur Berechnung der von der gesamten Kalorimeterbaugruppe absorbierten Wärme (q_cal) verwendet. <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-05.png" style="height: 40px;"> Da das Kalorimeter isoliert ist und keine Wärme an die Umgebung verloren geht, entspricht die vom Kalorimeter aufgenommene Wärme der durch die Reaktion freigesetzten Wärme. <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-06.png" style="height: 40px;"> Aufgrund konstanter Volumenbedingungen entspricht die bei der Reaktion freigesetzte Wärme der inneren Energieänderung. <img alt="Eq1" src="https://www.jove.com/files/core/CDNSource/lessons/797/797_Equations-07.png" style="height: 40px;"> Dies ist die innere Energieänderung für die spezifische Menge an Reaktanten, die einer Verbrennung unterzogen wird. ΔErxn pro Mol eines bestimmten Reaktanten erhält man, indem man den Wert durch die Anzahl der tatsächlich reagierten Mol dividiert. Bombenkalorimeter erfordern eine Kalibrierung, um die Wärmekapazität des Kalorimeters zu bestimmen und genaue Ergebnisse sicherzustellen. Die Kalibrierung erfolgt mithilfe einer Reaktion mit einem bekannten q, beispielsweise einer abgemessenen Menge Benzoesäure, die durch einen Funken eines Nickelsicherungsdrahtes entzündet wird und vor und nach der Reaktion gewogen wird. Die durch die bekannte Reaktion erzeugte Temperaturänderung wird zur Bestimmung der Wärmekapazität des Kalorimeters verwendet. Die Kalibrierung wird im Allgemeinen jedes Mal durchgeführt, bevor das Kalorimeter zur Erfassung von Forschungsdaten verwendet wird. Dieser Text wurde angepasst von <a href="https://openstax.org/books/chemistry-2e/pages/5-2-calorimetry">Openstax, Chemistry 2e, Section 5.2: Calorimetry.</a>

Kalorimetrie bei konstantem Volumen

Kalorimeter sind nützlich, um die Wärme zu bestimmen, die durch eine chemische Reaktion freigesetzt oder absorbiert wird. Kaffeetassen-Kalorimeter sind für den Betrieb bei konstanten ...

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bomb calorimeter heat measurement

Bomb calorimetry measures the heat released by reactions that produce a lot of energy, especially combustion reactions. A coffee cup calorimeter works at constant pressure and is useful for reactions in solution. A bomb calorimeter works at constant volume and is used for reactions that make large amounts of heat and gaseous products.

The word &quot;bomb&quot; refers to the strong, explosive force some reactions can have. In a bomb calorimeter, the volume does not change, so 94V = 0. That means the pressure-volume work is zero. The heat measured at constant volume, qv, is equal to the change in internal energy for the reaction.

A bomb calorimeter has a tough steel container that holds the reactants. The steel bomb sits in water. The sample is placed inside the bomb, and the chamber is filled with oxygen at high pressure. A small electrical spark ignites the sample, and the heat from the reaction warms the steel bomb and the surrounding water.

The temperature increase, 94T, is measured and combined with the known heat capacity of the calorimeter, Ccal, to find the heat absorbed by the whole setup, qcal. Because the calorimeter is insulated, the heat gained by the calorimeter equals the heat released by the reaction. Under constant volume conditions, this heat corresponds to the internal energy change for the amount of reactant that burned.

To compare results fairly, the internal energy change per mole is found by dividing by the number of moles that reacted. Bomb calorimeters also need calibration to measure heat capacity accurately. A known reaction, such as a measured amount of benzoic acid ignited by a spark from nickel fuse wire, is used for this step. The temperature change from that reaction gives the heat capacity, and calibration is usually done each time before research data are collected.

Bomb Calorimeter Heat Measurement

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constant pressure calorimetry

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Coffee cup calorimetry measures heat changes in reactions and physical changes using an insulated calorimeter. The calorimeter is calibrated and designed to limit heat exchange with the outside environment. That makes it possible to measure the heat taken in or released by a substance more accurately, including the energy content of foods. In calorimetry, the system is the substance or substances undergoing change. The surroundings are everything else inside the calorimeter, including the...

constant volume calorimetry

Bomb calorimetry measures the heat released by reactions that produce a lot of energy, especially combustion reactions. A coffee cup calorimeter works at constant pressure and is useful for reactions in solution. A bomb calorimeter works at constant volume and is used for reactions that make large amounts of heat and gaseous products. The word "bomb" refers to the strong, explosive force some reactions can have. In a bomb calorimeter, the volume does not change, so 94V = 0. That means the...

hess's law

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standard enthalpy of formation

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Enthalpy changes are often listed for reactions that start and end under the same conditions. Chemists use a standard state as a reference set of conditions for comparing properties. In IUPAC terms, the standard state means 1 bar of pressure and 1 M solutions, but it does not set a temperature. Many thermochemical tables still use 1 atm as the reference pressure. Because the difference between 1 bar and 1 atm is very small, enthalpy change usually stays almost the same. A superscripted o in...

enthalpies of reaction

Calculating reaction heat with Hess's law uses standard enthalpies of formation to find the enthalpy change of a reaction. When the formation values for the reactants and products are known, the overall reaction can be broken into simpler stepwise reactions. This approach helps show how the heat change for the full reaction is built from smaller parts. First, the reactants are thought of as being decomposed into their component elements. The enthalpy change for this step is proportional to the...

key terms and concepts

Learn how a bomb calorimeter measures combustion heat at constant volume, uses temperature change to find internal energy, and is calibrated with benzoic acid.

Bomb Calorimeter Heat Measurement | JoVE K12

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Bomb Calorimeter Heat Measurement

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