First slide

PH of strong acids and strong bases

Question

The pH of a base solution is 12.699. The amount of crystalline oxalic acid required to react with 2 lit of this base solution is (assume oxalic acid dissoiates completely)

Moderate

A

4.5 g
B

6.3 g
C

12.6 g
D

9 g

Solution

P^OH = 14 -12.699 = 1.3
⇒ [OH^-] = 5 x10^-2
Equivalents of H₂C₂O₄ = Equivalents of base
Crystalline oxalic acid has the following formula : H₂C₂O₄. 2H₂O
; $\frac{W_{a}}{GEW of acid} = V_{a} N_{a}; \frac{W_{a}}{63} = 2 \times 5 \times 10^{- 2}; W_{a} = 6.3 g;$

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