1. Tardigrade
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  3. Chemistry
  4. When 3 mol of HCl is added to 1 L of an acidic buffer, its pH changes from 3.9 to 2.5. The buffer capacity of the buffer solution is.

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Q. When $3 \,mol$ of $HCl$ is added to $1 \,L$ of an acidic buffer, its $pH$ changes from $3.9$ to $2.5$. The buffer capacity of the buffer solution is_____.

Equilibrium

Solution:

Buffer capacity

$=\frac{\text { Number of moles / litre of acid or base added }}{\text { changes in } pH \text { or } pOH }$

$=\frac{3}{3.9-2.5}=\frac{3}{0.6}=5$