Question

You have four solutions A, B, C, and D. the pH of solution A is 6, B is 9, C is 12 and D is 7. Arrange the above four solutions in the increasing order of ${\mathrm{H}}^{+}$ ions.

Answer 1

Given data:

1. The pH of solution A is 6.
2. The pH of solution B is 9.
3. The pH of solution C is 12.
4. The pH of solution D is 7.

As we know that;

1. The pH value represents the nature of the solution.
2. If the pH is more than 7 implies that the solution is basic in nature.
3. If the pH is less than 7 implies that the solution is acidic in nature.
4. For neutral solutions, the pH value is 7.
5. The pH value can be calculated by the formula $\mathrm{pH}=-\log \left[{\mathrm{H}}^{+}\right]$ where $\left[{\mathrm{H}}^{+}\right]$ is the concentration of hydronium ion $\left[{\mathrm{H}}^{+}\right]$.

From the given data we can say that;

1. Solution A is acidic in nature.
2. Solution B is basic in nature.
3. Solution C is basic in nature and it is more basic than solution B as its pH is more than that of solution B.
4. Solution D is neutral in nature.

Hence, the increasing order of given solutions ${\mathrm{H}}^{+}$ ion concentration is $\mathrm{C}<\mathrm{B}<\mathrm{D}<\mathrm{A}$.