QUIZ 1. In the Arrhenius definition of acids, what does the hydrogen ion become when an acid dissociates in solution? a. H2O b. H3O+ c. H+ d. OHAnswer: b. The H+ ion in an acid does not remain stable so that it combines with water to make a hydronium ion or H3O+ ion. 2. Which of the following is a base? a. HSO4 b. HCl c. NH3 d. KCl Answer: c. NH3 is a weak base because it is a proton acceptor, becoming NH4+. 3. What is the equilibrium constant for water? a. 1 b. 1 x 1014 c. 1 x 10-7 d. 1 x 10-14 Answer: d. The equilibrium constant for water is 1 x 10-14, which is an important number because it is the product of the base constant times the acid constant for an acid and its conjugate base.
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