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Salt hydrolysis
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Which of the following salts will give highest pH in water?$Na_2CO_3$ is a salt of a strong base and a weak acid, so its solution is basic and has the highest pH.
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Equimolar solutions of the following substances were prepared separately. Which one of these will record the highest pH value?$BaCl_2$ is a salt of a strong acid (HCl) and a strong base ($Ba(OH)_2$). It does not hydrolyse, so its solution is neutral (pH = 7).
$BeCl_2$ and $AlCl_3$ are salts of weak bases; their small, highly charged cations hydrolyse and make the solution acidic (pH < 7).
$Li^+$ is also small and slightly hydrolysed, so LiCl solution is very slightly acidic.
So $BaCl_2$ records the highest pH.