118 ML of 0

question 149

Multiple Choice

11.8 mL of 0.30 M HCl is added to a 122.0-mL sample of 0.210 M HNO₂ (K_a for HNO₂ = 4.0  10^-4) . What is the equilibrium concentration of NO₂^- ions?

• A) 2.9  10^-3 M
• B) 2.6  10^-2 M
• C) 4.2   10^-3 M
• D) 5.5  10^-4 M
• E) 9.2  10^-3 M

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