Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the Ka of hydrocyanic acid?
A) [H3O+][HCN]/[CN-]
B) [H3O+][CN-]/[HCN]
C) [HCN]/[ H3O+][CN-]
D) [HCN][CN-]/[ H3O+]
B
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