Calorimetry is the measurement of heat transfer. Devices that measure the amount

Question

Calorimetry is the measurement of heat transfer. Devices that measure the amount of heat released or absorbed during a process are called calorimeters. A Coffee cup calorimeter is the simplest calorimeter and is often used to measure the heats of chemical reactions at constant pressure (also called enthalpies). This calorimeter consists of a Styrofoam cup with a plastic lid and a thermometer. in today's workshop, we will use calorimetry to calculate the standard molar enthalpy of reaction or the enthalpy change that occurs in a system when 1 mole of matter is transformed by a chemical reaction at 1 atm: _Delta H = q_rxn (in J/mole, at constant P and p V-work only), where q = cm Delta T A student wants to measure the heat of neutralization reaction. To do this she mixed in a coffer cup calorimeter 35.0 mL of 0.70M HCI solution and 65.0 mL of 0.50M NaOH solution both at 22.0 degree C initially. She then continued to measure the temperature of the mixture for 10 minutes. Write a chemical equation, a complete ionic and a net ionic equation for this reaction.

Explanation / Answer

1)

chemical equation :

HCl (aq)   + NaOH(aq) ---------------------------> NaCl(aq)   + H2O(l)

complete ionic equation :

H+(aq) + Cl-(aq) + Na+ (aq)   + OH- (aq) ------------------------> Na+(aq) + Cl- (aq)   + H2O (l)

net ionic equation:

H+ (aq) + OH- (aq) ----------------------> H2O (l)

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