Problem: Describe the preparation of 500.0 mL of 0.1 M Carbonate buffer at pH = 10.0. You have a 2 M stock solution of H₂CO3 as well as pure salts of NaHCO3(s) (84.01 g/mol) and Na₂CO3 (106.01 g/mol) at your disposal.

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Problem: Describe the preparation
of 500.0 mL of 0.1 M Carbonate
buffer at pH = 10.0. You have a 2
M stock solution of H₂CO3 as well
as pure salts of NaHCO3(s) (84.01
g/mol) and Na₂CO3 (106.01 g/mol)
at your disposal.
Equilibria
H₂CO3 + H₂O → HCO3 + H3O+ Ka1 = 4.46 x 10-7; pka1 = 6.31
2-
HCO3 + H₂O → CO3²- + H3O+ K₁2 = 4.69 x 10-¹¹; pK₂2 = 10.32
a2
a2
Transcribed Image Text:) Problem: Describe the preparation of 500.0 mL of 0.1 M Carbonate buffer at pH = 10.0. You have a 2 M stock solution of H₂CO3 as well as pure salts of NaHCO3(s) (84.01 g/mol) and Na₂CO3 (106.01 g/mol) at your disposal. Equilibria H₂CO3 + H₂O → HCO3 + H3O+ Ka1 = 4.46 x 10-7; pka1 = 6.31 2- HCO3 + H₂O → CO3²- + H3O+ K₁2 = 4.69 x 10-¹¹; pK₂2 = 10.32 a2 a2
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