Question

The following questions is based on ionization of carbonic acid. [H2CO3 = H+ + HCO3- K1 = 4.7 X 10-7, pK1 = 6.34

] [HCO3- = H+ CO3-2 K2 = 4.4 X 10-11, pK2 = 10.36]

Calculate the pH ofthe solution form by mixing the following:

a)50.0ml of 0.100 M H2CO3 with 50.0ml of 0.050 M NaOH

. b)50.0ml of 0.100 M H2CO3 with 50.0ml of 0.150 M NaOH

. c)50.0ml of 0.100 M H2CO3 with 50.0ml of 0.100 M NaOH

. d)50.0ml of 0.100 M H2CO3 with 50.0ml of 0.200 M NaOH.

Note: sketches of pH curves for these reactions may be helpful in answering the questions.

Answer 1

u) When 5.a nW 아 O.ISom NaoH added Hca Then 11丿 Wa

Cull be 0 /6) PKMefy 9.S 6-3ヶ

O/L 0.05 M 2 ニpkaレ

び. No a614 14