An example of a neutral solution is either a sodium chloride solution or a sugar solution. A neutral solution has a pH equal to 7. Water is another common substance that is neutral on the pH scale.
The pH scale is useful for determining whether substances are alkaline, acidic or neutral. The scale is between 0 and 14 and shows the strengths of acids and bases. A substance is an acid if it is above 0 but less than 7. Bases or alkaline substances have pH numbers above 7. The closer the pH number is to 0, the more acidic it is. Substances with pH numbers closer to 14 are the most alkaline. Hydrochloric acid presents as being a strong acid with a pH of 1, and caustic soda has a pH of 13, making it a very strong base.