Worksheet: Buffer Solutions

In this worksheet, we will practice describing the procedure for preparing buffer solutions, selecting suitable glassware, and troubleshooting errors.

Q1:

Which acid in the table is most appropriate for the preparation of a buffer solution with a pH of 3.1?

Ionization ReactionHSO+HOHO+SO423+42HF+HOHO+F23+HNO+HOHO+NO223+2HCNO+HOHO+CNO23+CHCOH+HOHO+CHCO3223+32
𝐾a at 25C1.2×106.8×104.6×102×101.8×10
  • AHNO2
  • BHSO4
  • CCHCOH32
  • DHCNO
  • EHF

Q2:

Which base in the table is most appropriate for the preparation of a buffer solution with a pH of 9.28?

Ionization Reaction(CH)NH+HO(CH)NH+OH322322+CHNH+HOCHNH+OH32233+(CH)N+HO(CH)NH+OH33233+NH+HONH+OH324+CHNH+HOCHNH+OH6522653+
𝐾b at 25C5.9×104.4×106.3×101.8×104.3×10
  • ANH3
  • BCHNH32
  • C(CH)N33
  • D(CH)NH32
  • ECHNH652

Q3:

Which base in the table is most appropriate for the preparation of a buffer solution with a pH of 10.65?

Ionization Reaction(CH)NH+HO(CH)NH+OH322322+CHNH+HOCHNH+OH32233+(CH)N+HO(CH)NH+OH33233+NH+HONH+OH324+CHNH+HOCHNH+OH6522653+
𝐾b at 25C5.9×104.4×106.3×101.8×104.3×10
  • A(CH)NH32
  • BCHNH32
  • CCHNH652
  • DNH3
  • E(CH)N33

Q4:

Which acid in the table is most appropriate for the preparation of a buffer solution with a pH of 4.5?

Ionization ReactionHF+HOHO+F23+HCOH+HOHO+HCO223+2CHCOH+HOHO+CHCO3223+32HClO+HOHO+ClO23+HBrO+HOHO+BrO23+
𝐾a at 25C6.8×101.8×101.8×102.9×102.8×10
  • AHBrO
  • BHF
  • CCHCOH32
  • DHCOH2
  • EHClO

Q5:

Which one of the following pairs can be mixed to make a buffer solution?

  • AHCl, NaOH
  • BNHCl4, NaOH
  • CNHCl4, NaCl
  • DCHCOOH3, HCl
  • ENH3, NaOH

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