First slide

PH of strong acids and strong bases

Question

The pH of a sample of KOH solution is 12.3979. The weight of solid KOH of 70% pure required to prepare 2.5 lit of this solution is

Easy

A

3.5 g
B

5 g
C

8 g
D

6 g

Solution

P^OH = 14 - 12.3979 ~ 1.6
[OH^-] = 2.5 x10^-2
Let us consider, w g of KOH is required
$\frac{70 \times w}{100 \times 56 \times 2.5} = 2.5 \times 10^{- 2}$
⇒ w = 5

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