Question

What is the pH of distilled water?

Answer 1

Hint : pH is a scale used in chemistry to describe the acidity or basicity of an aqueous solution. Acidic solutions (those containing a larger concentration of ${{H}^{+}}$ ions) have a lower pH than basic or alkaline solutions. The pH scale is logarithmic, indicating the concentration of hydrogen ions in a solution in inverse order. Because the pH formula approximates the negative of the base 10 logarithm of the molar concentration of hydrogen ions in the solution, this is the case.

Complete Step By Step Answer:
At $25\text{ }{}^\circ C$ , acidic solutions have a pH less than 7, while basic solutions have a pH greater than 7. At this temperature, pH 7 solutions are neutral (e.g. pure water). The pH neutral value changes with temperature, becoming lower than 7 as the temperature rises. For highly strong acids, the pH value can be less than 0 and for very strong bases, it can be more than 14. By utilising the fact that indicators' colour varies with pH, they may be utilised to monitor pH. The colour of a test solution may be visually compared to a standard colour chart to obtain a pH reading that is accurate to the nearest whole integer.
Distillation is accomplished by heating water to a high temperature, allowing the steam to condense in a tube, and collecting the condensation in a container. Many compounds may be dissolved in water, and some of them may evaporate with it, but salts and other solid solutes are left behind. Even volatile solutes may be removed using sophisticated distillation processes, and if you use one of them, the collected condensate should be devoid of any solutes and have a pH of 7. That's probably what you'll discover if you measure the pH just after distillation, although it changes quickly.

Note :
Pure water has a pH of about 5.8, making it acidic. Water absorbs carbon dioxide and continues to do so until it reaches a state of equilibrium with the atmosphere. Carbon dioxide interacts with water in solution to form carbonic acid, which releases hydronium ions into solution, which is the same as releasing free hydrogen ions. A sample of distilled water takes roughly two hours to absorb all of the carbon dioxide it can from the environment and reach its final pH.