SATHEE: Equilibrium - Result Question 55

Equilibrium - Result Question 55

####57. Which of the following statements about $p H$ and $H^{+}$ ion concentration is incorrect? [2000]

(a) Addition of one drop of concentrated $H C l$ in $N H_{4} O H$ solution decreases $p H$ of the solution.

(b) A solution of the mixture of one equivalent of each of $C H_{3} C O O H$ and $N a O H$ has a pH of 7

(d) A cold and concentrated $H_{2} S O_{4}$ has lower $H^{+}$ ion concentration than a dilute solution of $H_{2} S O_{4}$

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Solution:

(b) $C H_{3} C O O H$ is weak acid while $N a O H$ is strong base, so one equivalent of $N a O H$ can not be neutralized with one equivalent of $C H_{3} C O O H$ . Hence the solution of one equivalent of each does not have $p H$ value as 7. Its $p H$ will be towards basic side as $N a O H$ is a strong base hence conc. of $O H^{-}$ will be more than the conc. of $H^{+}$ .

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Equilibrium - Result Question 55

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