Question

For which of the following titrations will the pH at the equivalence point be greater than...

For which of the following titrations will the pH at the equivalence point be greater than 7?

HF with KOH

NH3 with HBr

HCl with Ca(OH)2
NaF with HCl
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Answer #1

answer : HF with KOH

explanation:

1) HF + KOH ------------------> KF + H2O

here KF salt is formed it is the salt of strong base and weak acid . so the pH >7

2) NH3 + HBr --------------------> NH4Br

here the salt NH4Br is the weak base and strong acid. so the pH <7

3) 2HCl + Ca(OH)2 --------------------> CaCl2 + 2H2O

it is strong acid and strong base reaction. so the pH is exactly 7

4) NaF + HCl ----------------> NaCl + HF

NaCl is neutral salt and HF is weak acid. so the pH may be 7 or less than 7 .

so ultimate answer is first option

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