Question

In some solutions, the concentration of ${\text{H}}_{\text{3}}{\text{O}}^{\text{+}}$ remains constant even when small amounts of strong acid or strong base are added to them. These solutions are known as :

• A. Ideal solutions
• B. Colloidal solutions
• C. True solutions
• D. Buffer solutions

Answer 1

Answer: (D)

In acidic Buffer solutions when

$\text{pH}=\text{pKa}+\text{log}\frac{\left[\text{Salt}\right]}{\left[\text{Acid}\right]}$

pH is not disturbed i.e $\left[{\text{H}}_{\text{3}}{\text{O}}^{\text{+}}\right],$ remains constant on addition of small quantity of acid or Base.