First slide

Buffer Capacity

Question

2 g of NaOH per 250 ml of solution is added to a buffer solution of buffer capacity 0.2. Then the change in pH is

Moderate

A

0.5
B

1
C

1.5
D

2.0

Solution

per 250 ml ,moles of NaOH addaed $\large = \frac{2}{{40}}\$
per 1000ml , moles of NaOHadded $\large = \frac{2}{{40}} \times 4 = 0.2\$
Given buffer capacity =0.2
When 0.2 moles of OH^- is added, P^H changes by 1 unit

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