Author Question: You have solutions of 0.200 M HNO2 and 0.200 M KNO2 (Ka for HNO2 = 4.00 104). A buffer of pH 3.000 ... (Read 138 times)

Deast7027 · **on:** Mar 21, 2021

Question 1

You have a 250.0-mL sample of 1.00 M acetic acid (K_a= 1.8 × 10^–5). Calculate the pH after adding 0.0050 mol of NaOH to 1.0 liter of the best buffer solution.

◦ 7.05
◦ 2.41
◦ 3.54
◦ 4.78
◦ None of these are correct.

Question 2

You have solutions of 0.200 M HNO₂ and 0.200 M KNO₂ (K_a for HNO₂ = 4.00 × 10^–4). A buffer of pH 3.000 is needed. What volumes of HNO₂ and KNO₂ are required to make 1 liter of buffered solution?

◦ 500 mL of each
◦ 286 mL HNO₂; 714 mL KNO₂

◦ 413 mL HNO₂; 587 mL KNO₂

◦ 714 mL HNO₂; 286 mL KNO₂

◦ 587 mL HNO₂; 413 mL KNO₂

mfedorka · **Reply #1 on:** Mar 21, 2021

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