Author Question: Consider a solution made by mixing HCN (Ka= 6.2 1010) with HC2H3O2(Ka= 1.8 105) in aqueous ... (Read 69 times)

HudsonKB16 · **on:** Mar 21, 2021

Question 1

Carbonic acid is a diprotic acid, H₂CO₃, with K_a1 = 4.2

10^–7 and K_a2 = 4.8

10^–11 at 25ºC. The ion product for water is K_w = 1.0

10^–14 at 25ºC. What is the OH^– concentration of a solution that is 0.18 M in Na₂CO₃?

◦ 6.1

10^–3M
◦ 2.1

10^–4M
◦ 6.5

10^–5M
◦ 2.9

10^–6M
◦ 2.7

10^–4M

Question 2

Consider a solution made by mixing HCN (K_a= 6.2 × 10^–10) with HC₂H₃O₂(K_a= 1.8 × 10^–5) in aqueous solution. What are the major species in solution?

◦ H⁺, CN^–, H⁺, C₂H₃O₂^–, H₂O
◦ HCN, H⁺, C₂H₃O₂^–, H₂O
◦ H⁺, CN^–, HC₂H₃O₂, H₂O
◦ H⁺, CN^–, H⁺, C₂H₃O₂^–, OH^–, H₂O
◦ HCN, HC₂H₃O₂, H₂O

cam1229 · **Reply #1 on:** Mar 21, 2021

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