Question

The pH of three solution A, B and C are 4, 9 and 6 respectively. Arrange them in increasing order of acidic strength.

Answer 1

pH is the measure of the concentration of ${\mathrm{H}}^{+}$ions, and it expresses the acidic or basic nature of the solution.

pH scale imparts different color depending on the pH of the solution:

pH	color
<3	red
4-5	orange
7	green
8-11	blue
11-13	purple
14	violet

The increasing order of acidic strengths of given solutions are

B (pH=9) < C (pH=6) < A (pH=4)