Chemistry Regents Practice Test 2025 – The All-in-One Guide to Exam Success!

Question: 1 / 400

Which substance is considered neutral on the pH scale?

All acids

All bases

pH 0

pH 7

A substance is considered neutral on the pH scale when it has a pH of 7. This means that the concentration of hydrogen ions (H⁺) is equal to the concentration of hydroxide ions (OH⁻) in the solution. Pure water is a prime example of a neutral substance, as it has a pH of 7 at 25°C. At this point, neither acidic nor basic properties dominate, making it an ideal reference point on the pH scale.

Acids have a pH less than 7, indicating a higher concentration of H⁺ ions, while bases have a pH greater than 7, indicating a higher concentration of OH⁻ ions. Therefore, the other choices do not represent neutral substances, as all acids and bases explicitly define properties on either side of the neutral point, and a pH of 0 reflects a very strong acid, which is far from being neutral.

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