Acids are characterized by their ability to donate protons (H+ ions) in a chemical reaction, which is known as a proton transfer reaction. This is the basis of the Bronsted-Lowry definition of acids and bases. The other choices (A, B, and C) are characteristics of bases, not acids.

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An Acid

Question 28

Multiple Choice

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) does none of these choices.

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