Chemistry 12:  U4 # 74-79 and the legal sized WS (Review of 4.1 to 4.12) are due Friday.  Today I collected Lab 20G.

K_a Calculations Answer Key

74.  [H⁺] = 6.7 x 10^-5

75.  pH 6.16

76.  [HCOOH] = .78 M

77.  Ka = 9.38 x 10^-3

78.  [H2CO3]  = 0.010 M

79.  pH 4.89

80.  Ka = 2.06 x 10^-10

Chemistry 11:  Homemade WS on Lewis Dot Structures.  We started Lab 6D today - please do Questions # 1-5.