Equilibrium - Result Question 39
####41. Which of the following salts will give highest $pH$ in water?
[2014]
(a) $KCl$
(b) $NaCl$
(c) $Na_2 CO_3$
(d) $CuSO_4$
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Solution:
- (c) $Na_2 CO_3$ is a salt of strong base $(NaOH)$ and weak acid $(H_2 CO_3)$. On hydrolysis this salt will produce strongly basic solution. i.e. $pH$ will be highest $(pH>7)$ for this sotluion. Others are combination of $KCl=$ Strong acid + Strong base
$arrow$ neutral solution $(pH \approx 7)$
$NaCl=$ Strong acid + Strong base
$arrow$ neutral solution $(pH \approx 7)$
$CuSO_4=$ Strong acid + wake base
$arrow$ Acidic solution $(pH<7$ )
