An acid solution of pH 6 is diluted hundred times. The pH of resulting solution approximately becomes

• (A) 6.95
• (B) 6
• (C) 4
• (D) 9

When an acid solution with a pH of 6 is diluted by a factor of 100, the concentration of hydrogen ions decreases significantly. The pH scale is logarithmic, meaning that each whole number change on the scale represents a tenfold change in acidity or alkalinity.

Calculating the New pH

To find the new pH after dilution, we can use the formula:

• pH = -log[H⁺]

Initially, a pH of 6 corresponds to a hydrogen ion concentration of:

• [H⁺] = 10^-6 M

When diluted 100 times, the new concentration becomes:

• [H⁺] = 10^-6 M / 100 = 10^-8 M

This concentration corresponds to a pH of:

• pH = -log(10^-8) = 8

Final Answer

Therefore, the pH of the resulting solution is approximately 9. The correct option is (D) 9.