# Which of the following has pH value 7? (a) Pure water (b) Neutral solution (c) Basic solution (d) Acidic solution (e) None of the above

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Updated on: September 25th, 2023

None of the above/More than one of the above has pH value 7. pH is equal to the negative logarithm of the concentration of hydrogen ions: pH equals log [H]. Around the H are square brackets that stand for “concentration” in comparison to pure water.

• Pure water – pH 7
• Neutral solution – pH 7
• Basic Solution – pH more than 7
• Acidic Solution – pH less than 7

### pH value of 7

The pH scale uses a logarithmic measurement system to determine acidity and alkalinity. Acidic is defined as a pH value below 7 and basic as a pH value above 7. A chemical that contributes hydrogen ions is called an acid. The ratio of hydrogen ions to hydroxide ions changes when an acid is dissolved in water. The solution is acidic because there are more hydrogen ions than hydroxide ions in it. An object that accepts hydrogen ions is called a base.

• When a base dissolves in water, the ratio of hydrogen ions to hydroxide ions changes in the opposite direction.
• A solution with more hydroxide ions than hydrogen ions results from the base soaking up hydrogen ions, making the solution alkaline.

Summary:

## Which of the following has pH value 7? (a) Pure water (b) Neutral solution (c) Basic solution (d) Acidic solution (e) None of the above

No/More than one of the aforementioned has a pH value. pH greater than 7 Pure water, pH 7, a neutral solution, pH 7, and a basic solution, pH less than 7 indicates an acidic solution.

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