Question

What is the pH of distilled water?

Answer 1

Hint: We need to know that the pH tells the acidity and basicity of any aqueous solution or substance. If pH is more than seven the substance will be basic. If pH is less than seven then the substance is acidic. A pH is the concentration of $H^{+}$ ions in any aqueous solution.

Complete answer:
Neutral species or solutions always have a pH equal to $7$ as it is not acidic or basic in nature. When we talk of water it generally has a pH of $7$, since it is not acidic or basic in nature. Distilled water is a form of purified water. Distilled water is water that has been boiled into vapor and condensed back into liquid in a separate container. Impurities in the original water that do not boil below or near the boiling point of water remain in the original container. The pH of distilled water is $7$ when it is in pure state or form but because it absorbs carbon dioxide from the atmosphere, it's actually slightly acidic with a pH of $5.8$, so due to the presence of acidic species in distilled water it turns out be slightly acidic in nature as its pH value is close to $7$ that is for mild acids.

Note:
Many of us confuse between deionized and distilled water so De ionized (DI) water is water that has been treated to remove all ions – typically, that means all of the dissolved mineral salts. Distilled water has been boiled so that it evaporates and then re-condensed, leaving most impurities behind.