• # question_answer Which of the following, when mixed, will give a solution with pH > 7? A) 100 mL 0.1 M HCl+100mL 0.1 M KCl B) 100 mL 0.1M ${{H}_{2}}S{{O}_{4}}$+100 mL 0.1M NaOH C) 100 mL 0.1M${{\operatorname{CH}}_{3}}COOH$+100mL 0.1M KOH D) 50 mL 0.1M HCl+50mL 0.1 M $C{{H}_{3}}COONa$

 [a] $[{{H}^{+}}]=\frac{100\times 0.1}{200}=0.05,pH<7$ [b] Meq of ${{\operatorname{H}}_{2}}S{{O}_{4}}=2\times 0.1\times 100=20$ Meq of $NaOH = 0.1 \times 100 = 10$ Meq of excess ${{\operatorname{H}}_{2}}S{{O}_{4}}=20-10=10;pH<7$
 [c] ${{\operatorname{CH}}_{3}}COOH+KOH\xrightarrow{{}}C{{H}_{3}}COOK+{{H}_{2}}O$ $[Salt]=\frac{0.1\times 100}{200}=0.05\operatorname{M};pH>7$ due to hydrolysis of salt of weak acid with a strong base. [d] $C{{H}_{3}}COONa+ HCl \xrightarrow{{}} C{{H}_{3}}COOH +NaCl$ $[C{{H}_{3}}COOH]=\frac{0.1\times 50}{100}=0.05M,pH<7$