An acid
A)produces hydroxide ions when dissolved in water.
B)changes the color of phenolphthalein indicator from colorless to pink.
C)donates electrons in an electron transfer reaction.
D)donates protons in a proton transfer reaction.
E)None of these choices are correct.

Question

Quizplus · Accepted Answer

An acid is a substance that donates protons (H+) in a proton transfer reaction. Choice A is incorrect as the production of hydroxide ions is characteristic of a base. Choice B is also incorrect as phenolphthalein indicator changes color in the presence of a base, not an acid. Choice C is incorrect as electron transfer reactions are characteristic of redox reactions, not acid-base reactions.

An Acid