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Question

Which of the following would give the highest pH when dissolved in water to form a 0.10M solution?

A
A strong acid
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B
A weak acid
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C
The sodium salt of a strong acid
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D
The sodium salt of a weak acid
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Solution

The correct option is D The sodium salt of a weak acid
For a highest pH, we need to have pH greater than 7 which implies basic character.
This can be achieved either by a strong base or a salt of strong base and weak acid.
From the given options, sodium salt of weak acid will give basic character.

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