Author Question: A buffer was prepared by adding 2.4 g of ammonium nitrate to 100.0 mL of 0.30 M aqueous ammonia (Kb ... (Read 35 times)

Anajune7 · **on:** Jul 8, 2021

Question 1

A buffer is 0.282 M C₆H₅COOH(aq) and 0.282 M C₆H₅COONa(aq). Calculate the pH after the addition of 0.150 moles of nitric acid to 1.0 L of the buffer. For C₆H₅COOH, pK_a = 4.20.
◦ 3.69
◦ 4.20
◦ 4.71
◦ 3.87
◦ 7.00

Question 2

A buffer was prepared by adding 2.4 g of ammonium nitrate to 100.0 mL of 0.30 M aqueous ammonia (K_b = 1.8 × 10^-5). To this solution was then added 10.0 mL of 0.30 M aqueous sodium hydroxide, which caused a pH change of ________.
◦ 3.0 pH units
◦ 0.30 pH units
◦ 0.90 pH units
◦ 0.09 pH units
◦ zero

reversalruiz · **Reply #1 on:** Jul 8, 2021

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