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Question
One of the following salts will give an alkaline solution on dissolving in water. This is:
a) Na2CO3
(b) Na2SO4
(c) NaCl
(d) (NH4)2 SO4
Solution
Na2CO3
Na2CO3 is formed from a weak acid, carbonic acid (H2CO3), and a strong base, sodium hydroxide (NaOH). On dissolving in water, Na2CO3 hydrolyses to form more OH- ions than H+ ions. Therefore, its solution in water is basic, or alkaline, with a pH more than 7.
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