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Question:

An acid with a pH of 3 was spilled on the floor of the laboratory. Which substance should be added to the spill to neutralize the acid?

A Baking soda
Explaination

Baking soda has a pH of 9, which, when added to the spill with a pH of 3, would neutralize the acid. Distilled water would be adding an already neutral substance to an acid, which would raise the pH but not make it neutral. Adding orange juice, which has a pH of 3, to the spill would leave the pH at 3, and adding sea water, which has a pH of 8, would raise the pH but not to neutral.