Adding an acidic solution.
You test for pH so you know whether a liquid is an acid or base. Depending on the answer, the liquid has a different response to what you mix in with it. In the body, pH balance is important as well.
Use a pH-paper.
Different soaps have different pH balances. In choosing the right soap for yourself, look for a soap with a pH balance from 4 to 7. Soaps with a pH balance of less than 3 or more than 8 can irritate your skin.
The easiest way to determine the pH of a solution is to use a pH meter.
You use Universal Indicator solution.
use to test the acid level in liquid.
Liquid chlorine raises the pH since liquid (sodium hypochloride) tablet or granular (calcium hypochloride) are basically alkaline, continued use increases the pH above 7.6. to counteract this an acid must be used.
It can be used with most liquids. pH paper (or tape) test the acid in a liquid.
According to the article "Average PH Levels of Common Cleaning Supplies" on about.com, any dish-washing soap marketed as "Mild" or "Easy on the hands" is likely to have a pH of 7-8.
Distilled water can be used in school labs to clean apparatus before switching between chemicals. Like measuring pH balance of different liquids you would use a pH indicator and when switching between the liquid you would clean the equipment with distilled water before dipping it into another solution
if u mean by the Ph balance then Orange Juice have the Ph balance of 2.8 Oranges have the Ph balance of as low as 2.9 and highest as 4.0
If you combine the two together, you will get a neutral liquid.