First slide

PH of strong acids and strong bases

Question

The pH of a dibasic acid is 3.699. Its molarity is

Moderate

A

2 x 10^-4
B

4 x 10^-4
C

2 x 10^-3
D

1 x10^-4

Solution

The question does not provide dissociation constants values and so we will consider it to be a strong acid. $H_{2} A \to 2 H^{+} + A_{M}^{- 2}$
P^H = 3.7
⇒ P^H = 4 - 0.3 = 4 - log 2
⇒ [H⁺] = 2 x 10^-4
$N_{a} = 2 \times 10^{- 4} N; M_{a} = \frac{N_{a}}{2} = 10^{- 4} M;$

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