Question

how could a student determine whether an unknown chemical is an acid? test the hydrogen ion concentration in the sample. measure the boiling point of the sample. weigh the sample before and after adding salt. determine whether the sample has surface tension.

Explanation:

Acids release hydrogen ions in solution. Measuring hydrogen - ion concentration can indicate if a substance is an acid. Boiling point, weighing with salt addition, and surface - tension are not related to the acidic nature of a chemical.

Answer:

Test the hydrogen ion concentration in the sample.