15.0 mL of 0.50 M NaOH is added to a 100.-mL sample of 0.379 M ...

[dejastew]

Question 1

15.0 mL of 0.50 M HCl is added to a 100.-mL sample of 0.478 M HNO₂ (K_a for HNO₂ = 4.0 × 10^–4). What is the equilibrium concentration of NO₂^– ions?

◦ 2.5 × 10^–3M
◦ 1.7 × 10^–4M
◦ 4.2 × 10^–1M
◦ 5.0 × 10^–2M
◦ None of these are correct.

Question 2

15.0 mL of 0.50 M NaOH is added to a 100.-mL sample of 0.379 M NH₃ (K_b for NH₃ = 1.8 × 10^–5). What is the equilibrium concentration of NH₄⁺ ions?

◦ 9.5 × 10^–3M
◦ 5.9 × 10^–6M
◦ 3.3 × 10^–1M
◦ 9.1 × 10^–5M
◦ None of these are correct.

[Carliemb17]

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[dejastew]

TYSM

[scottmt]

Thanks for the timely response, appreciate it