Author Question: How many moles of HCl need to be added to 150.0 mL of 0.50 M NaZ to have a solution with a pH of ... (Read 55 times)

abern · **on:** Mar 21, 2021

Question 1

How many millimoles of HCl must be added to 100 mL of a 0.100 M solution of methylamine (pK_b= 3.36) to give a buffer having a pH of 10.00?

◦ 8.1
◦ 18.7
◦ 20.0
◦ 41.5
◦ 12.7

Question 2

How many moles of HCl need to be added to 150.0 mL of 0.50 M NaZ to have a solution with a pH of 6.50? (K_a of HZ is 2.3 × 10^–5)? Assume negligible volume of the HCl.

◦ 6.8 × 10^–3
◦ 7.5 × 10^–2
◦ 5.0 × 10^–1
◦ 1.0 × 10^–3
◦ None of these are correct.

yifu223 · **Reply #1 on:** Mar 21, 2021

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