Based on the notion of weak and strong acids and bases, which of the following t

Question

Based on the notion of weak and strong acids and bases, which of the following three reactions would you expect to produce the largest (most negative) ?Hneut? The smallest ?Hneut?

Thermochemistry Experiment 3 Name PRELAB ?UESTIONS 1. Based on the notion of weak and strong acids and bases, which of the following three reactions would you expect to produce the largest (most negative) ?11nent? The smallest ?1Lett? ag) (continued on next page) Skyline College Chemistry 210 Laboratory Manual (Spring 2016 Revision -JM) 10

Explanation / Answer

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

HCl is a strong acid

NaOH is a strong base

heat of neutralization of a strong acid and strong base is -55.8 kJ/mol

B) NH4OH(aq) + HC2H3O2(aq) --------> C2H3O2NH4(aq) + H20(l)

NH4OH is a weak base

HC2H3O2 is a weak acid

So, heat of neutralization is very less than -55.8 kJ/mol

C) NH4OH(aq) + HNO3(aq) --------> NH4NO3(aq) + H2O(l)

NH4OH is a weak base

HNO3 is a strong acid

So, heat of neutralization is less than -55.8 kJ/mol

the largest (most negative) is in equation A

the smallest ( less negative ) is in equation B

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