Question

The hydrogen ion concentration in a given solution is $6\times {{10}^{-4}}$. Its pH will be:
(A) 6
(B) 4
(C) $\text{3}\cdot \text{22}$
(D) 2

Answer 1

pH is a measure of how acidic/basic water is. The range goes from 0 - 14, with 7 being neutral. pH of less than 7 indicates acidity, whereas a pH of greater than 7 indicates a base. It is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

Formula used: pH= $-$log (concentration of H$^+$)

Complete step by step solution:
The pH of any concentration is totally depending on the hydrogen ions consistent with that concentration. We can say that pH totally depends on the ions. The concentration of hydrogen ions in any solution depends on the range which consists by mole per litre of that solution. So, there is a formula to find out the pH of any concentration of any solution
pH= $-$log (concentration of H$^+$)
Now we have the value of concentration of H$^+$ ions = $6\times {{10}^{^{-4}}}$
Then put this valve in above formula, we get,
pH= $-\text{log}(6\times {{10}^{-4}})=3\cdot 22-\text{log}(6\times {{10}^{-4}})=3\cdot 22$
Additional information: pH is very useful in many aspects. The pH of water determines the solubility and biological availability of chemical constituents such as nutrients and heavy metal. Metals can be more toxic if their pH is lower because its solubility in water increases. In agriculture, soil pH value matters for the crop production as acidic soil is considered as infertile.

Note: Concepts of pH should be clear. Knowledge of pH theory should be there to solve the problems. pH formula should be learnt. pH stands for potential of hydrogen or power of hydrogen. It is used in laboratories for determining pH of different compounds. Acid cause tooth decay as pH for mouth is $5\cdot 5$ when it becomes lower tooth enamel gets corroded.