Experiment 13 Enthalpies inPor Chemical Changes Partner Date A. Heat of Solution

Question

Experiment 13 Enthalpies inPor Chemical Changes Partner Date A. Heat of Solution l. Temperature of lithium chloride added tol 5 mL of water .010 40e 2. Temperature of ammonium, chloride and water 1 3. Temperature of glucose and water - B. Heat of Reaction Test Tube First Reagent T Number ReagentTemperature Temperature (6 mL) Temperature Reagent (6 mL.) 6 M HCI an.tre16MNdH | g Questions 1. What is "enthalpy"? mea surement of eneqy in a memodunamic SustCm 2. Which is greater for ammonium chloride; the láttice energy or the hydration energy? lame eneray is greater. Hydrahn eneray is nof high nolugh to dfset energy heeded Cissouae the tarice. 71

Explanation / Answer

3. Test tube 1 4 5 and 6 have same rexn as it has HCl and NaOH, HCl+ NaOH---------> NaCl+H2O

Testube 2

HCl+KOH--------->KCl +H2O

Testube 3

H2SO4+ NaOH -------->NaSO4+H2O

8. there is no effect on total temperature change upon changing the order of mixing. However the reaction would be neutralization.

10. Yes conc. Of HCl effects the reaction. As the conc increases neutralizing of NaOH accelerates. I, e more the conc more is the neutralization more is the union of ions hence more is the heat liberated.

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