Hydrocyanic Acid, HCN, Is a Weak Acid

question 26

Multiple Choice

Hydrocyanic acid, HCN, is a weak acid. Which of the following is the correct expression for the K_a of hydrocyanic acid?

• A) [H₃O⁺][HCN]/[CN⁻]
• B) [H₃O⁺][CN⁻]/[HCN]
• C) [HCN]/[ H₃O⁺][CN⁻]
• D) [HCN][CN⁻]/[ H₃O⁺]

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