Chemistry 12:  After a short review we did Unit 4 # 84-88.  We took notes on Indicators, read section 4.17, and did Unit 4 # 108 - 118.  All of the textbook work is due on the Tuesday we return from Spring Break.  We finished off with a quiz on Ka calculations and Hydrolysis problems.

84.  0.024 M SO₃^2-

85.  0.0019 M OH^-, pH 11.28, pOH 2.72, 5.3 x 10^-12 M H⁺

86.  0.059 M N₂H₄

87.  K_b = 1.04 x 10^-3

88. pH 11.50

66.  0.929 g LiOH

80.  K_a = 2.06 x 10^-10