Textbook Question
Match the following descriptions of titration curves with the diagrams: (a) strong acid added to strong base. [Section 17.3]
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18. Aqueous Equilibrium
Strong Titrate-Strong Titrant Curves
Multiple Choice
Which combination would give a pH = 7.0 at the equivalence point?
a) HNO3 and NH3 b) HCl and NH4+ c) HC2H3O2 and NaOH d) HBr and NaH
A
HNO3 and NH3
B
HCl and NH4+
C
HC2H3O2 and NaOH
D
HBr and NaH
Verified step by step guidance1
Identify the type of reaction that occurs at the equivalence point for each combination. At the equivalence point, the moles of acid equal the moles of base.
Consider the nature of the acid and base in each combination. A strong acid and a strong base will result in a neutral solution (pH = 7) at the equivalence point.
Analyze each option: (a) HNO3 and NH3 involves a strong acid and a weak base, resulting in an acidic solution at the equivalence point. (b) HCl and NH4+ involves a strong acid and a weak base, also resulting in an acidic solution. (c) HC2H3O2 and NaOH involves a weak acid and a strong base, resulting in a basic solution.
Evaluate option (d) HBr and NaH. HBr is a strong acid and NaH is a strong base. The reaction between a strong acid and a strong base will produce a neutral solution at the equivalence point.
Conclude that the combination of HBr and NaH will give a pH of 7.0 at the equivalence point, as it involves a strong acid and a strong base.
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