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Which of the following has the highest pH?

0.10 M NaCl
0.10 M HCl
0.10 M NaOH
0.10 M NaNO2

1 Answer

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The answer is 0.10 M NaOH. The NaCl is neutral. The HCl is acid. NaOH and NaNO2 are base. The base has higher pH than acid. The NaNO2 is weak base while NaOH is strong base. So the NaOH has higher pH than NaNO2.
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