Question

Which of the following could you add to 100.0 mL of 1.0 M HCN to make a suitable buffer system? (There may be more than one correct answer.)

100.0 mL of 0.050 M NaCN, 100.0 mL of 0.20 M NaCN, 100.0 mL of 1.0 M NaCN, 100.0 mL of 0.050 M NaCl, 100.0 mL of 0.20 M NaCl,

100.0 mL of 0.050 M HCN, 100.0 mL of 0.20 M HCN, 100.0 mL of 1.0 M HCN, 50.0 mL of 1.0 M NaOH, 100.0 mL of 1.0 M NaCl,

50.0 mL of 1.0 M HCl, 100.0 mL of 1.0 M HCl, 150.0 mL of 1.0 M HCl, 150.0 mL of 1.0 M NaOH, 150.0 mL of 1.0 M HCN

Answer 1

Components of an Acidic buffer weak Acid + salt of its conjugate Base Here we have 100.0m2 of 1.0M HEN [Weak Acid] and hence we can add salt of its conjugate base ie CNO (may be Nach, KCN etc) to make a buffer. # to make a acid and similar effective buffer, the concentration of weak of its conjugate base should be almost salt Among the options, salts we have NacN), Nace, NaOH, Hce) ACCEPTED REJECTED Not a salt of LCN All these solution can be add to make a buffer: - • 100.0 ml of oosom NOCNE NOT a good idea because buffer formed will not be o 100.0mL of 0.20M NOCN that effective & Na CN These two solutions 6 . 100.0mL of 1.0M will make a effective buffer Sol" (B) will make more effective buffer than sol" (A) Please Rate ...)