Question

Which of the following is the Arrhenius definition of an acid?

a substance that donates a hydrogen ion to another substance during a reaction

a substance that increases the concentration of hydronium ions when dissolved in water

a substance that accepts a lone-pair of electrons during a reaction

a substance that has a pH less than 7

Answer 1

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An Arrhenius acid is a substance that when added to water increases the number of H+ ions in the water.