question archive Which of the following buffer systems would be the best choice to create a buffer with pH = 7
Which of the following buffer systems would be the best choice to create a buffer with pH = 7
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Which of the following buffer systems would be the best choice to create a buffer with pH = 7.3?
Part A
Answer:HClO/KClO
For the best system, calculate the ratio of the masses of the buffer components required to make the buffer.
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HClO/KClO are all weak acid systems. They would give a buffer with pH < 7.0.
Mr HClO = 52.45 gr/mol
Mr KClO = 90.53 gr/mol
pH = 7.3, then [H+] = 10^-7.3 M
[H+] = Ka (mol acid/mol salt)
10^-7.3 = 2.88x 10^-8 x [(mass/Mr acid)/(mass/Mr salt)]
1.7 = (m acid/52.45) : (m salt/90.53)
then you''ll get
1.7 = 1.72 (m acid/m salt)
so the ratio of m acid : m salt is 0.98 : 1
