150 ML of 0

question 74

Multiple Choice

15.0 mL of 0.50 M HCl is added to a 100.0-mL sample of 0.484 M HNO₂ (K_a for HNO₂ = 4.0 × 10^-4) .What is the equilibrium concentration of NO₂^- ions?

• A)4.2 × 10^-1 M
• B)1.7 × 10^-4 M
• C)5.1 × 10^-2 M
• D)2.6 × 10^-3 M
• E)none of these

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