Chemistry 12:  U4 # 74-80.  Today I collected Lab 20B and unit 4 # 69, 71

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 12:  Unit 4 # 69, 71.  Lab 20B due Tuesday too.  Test next Friday on Acids and Bases (Unit 4).

Chemistry 12:  Today we learned how to find the Keq value for a Bronsted-Lowry equilibrium between a weak acid and weak base.  Unit 4 # 38 - 42 is due on Monday.  Lab 20B will be due on Tuesday.

Chemistry 12:  Unit 4 # 58 - 64.   Make sure that unit 4 # 47-57 (skip 54) is done too, from Monday.

Chemistry 12:  On Friday, we did Unit 4 # 31 - 37, and this was due today.  We learned about pH and pOH this afternoon, and you were asked to do Unit 4 # 47-57 (skip 54) for Tuesday.

Chemistry 12:  Unit 4 # 1-19, 21-24, and 28-30 should be done for Friday.

Grade 8 Volleyball:  Thanks for coming to the Super Tuesday Grade 8 Volleyball Wind-up Extravaganza Jamboree yesterday!  Stay tuned for more opportunities to play volleyball at RSS.

Chemistry 12: Unit 4 # 1-10 due Wednesday.  We started # 11-14, but this is not due until Friday. Please check the grades below to ensure that all is accurate.