Question

What is the \[{\text{pH}}\] value of pure water?

Answer 1

Hint:
The ${\text{pH}}$ range for water varies from the surface of earth to ground. Mostly the water is found in the ${\text{pH}}$ range of $6.5 - 8.5$ but if the water is pure then it has the ${\text{pH}}$ value 7 because it is neither acidic nor basic, it is neutral in nature.

Complete step by step answer:
The ${\text{pH}}$ value represents the power of hydrogen. Basically it is the measure of hydrogen ion concentrations. A scale is defined to measure the ${\text{pH}}$, ${\text{pH}}$ scale which shows the concentration of hydrogen ions. This scale has a range of numbers from $0 - 14$ . The substances having the ${\text{pH}}$ value between $0{\text{ to }}7$ are termed as acidic substances and the substances having the ${\text{pH}}$ value between ${\text{7 to 14}}$ are termed as basic substances.
Remaining matters, which have ${\text{pH}}$ value $7$ are neutral.

So this ${\text{pH}}$ value tells us the nature of substance whether it is acidic, basic or neutral.
The ${\text{pH}}$ range of water varies with the place and condition. The ${\text{pH}}$ value of water present on the surface of earth ranges from $6.5 - 8.5$ and the ${\text{pH}}$ value of ground water ranges from $6 - 8.5$ .

Hence we can say that the ${\text{pH}}$ value of water is not consistent on earth but here we have to tell the ${\text{pH}}$ value of pure water. So the ${\text{pH}}$ value of pure water 7. The nature of pure water is neither acidic nor basic, it is totally neutral in nature.
The nature of water changes along with the change in temperature. If the temperature is increased the water will start showing acidic characters because due to increase in temperature the water will dissociate and ${H^ + }$ ions are released which are the cause of increasing acidic characters of water.



Note:
The ${\text{pH}}$ value for a substance is always inversely proportional to the acidic character. If the ${\text{pH}}$ value is more than we can say that the substance is less acidic and if the ${\text{pH}}$ value is less then we can say that substance is more acidic.