Open Question
A buffer solution is made by dissolving H₃PO₄ and NaH₂PO₄ in water. (10.8)b. Write an equation that shows how this buffer neutralizes added base.
10. Acids and Bases
Buffers
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Which of the following combinations can result in the formation of a buffer?
A
50 mL of 0.10 M HF with 50 mL of 0.10 M NaOH.
B
50 mL of 0.10 M HNO2 with 25mL of 0.10 M Ca(OH)2
C
50 mL of 0.10 M CH3CO2H with 60 mL of 0.10 M NaOH
D
50 mL of 0.10 M HF with 30 mL of 0.10 M NaOH.
Verified step by step guidance1
Understand that a buffer solution is typically made from a weak acid and its conjugate base or a weak base and its conjugate acid.
Identify the weak acids in the given combinations: HF (hydrofluoric acid), HNO2 (nitrous acid), and CH3CO2H (acetic acid).
Recognize that NaOH and Ca(OH)2 are strong bases that can react with the weak acids to form their conjugate bases.
Calculate the moles of each reactant in the combinations to determine if the reaction will result in a buffer. For example, for HF and NaOH: moles of HF = 0.10 M * 0.050 L = 0.005 moles, moles of NaOH = 0.10 M * 0.050 L = 0.005 moles.
Determine if the reaction between the weak acid and the strong base will result in a buffer by checking if there is an excess of the weak acid or if the amounts are such that both the weak acid and its conjugate base are present in significant amounts after the reaction.
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