A chemist needs to buffer a particular solution between pH 3.50 and 4.00 at 25 °C. Consider the pKą values (all at 25 °C) and determine which solution is most appropriate for the task. HCIO pK₂ = 1.96 C6H5CO₂H pK₂ = 4.19 C5HẠNH* pK₂ = 5.25 HBrO pka = 8.70 HCN pK₂ = 9.21 C6H5CO₂H and KC6H5CO2 C5H4NHCI and C5H4N HBrO and KBrO HCIO and NaCIO OHCN and NaCN

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A chemist needs to buffer a particular solution between pH 3.50 and
4.00 at 25 °C. Consider the pKą values (all at 25 °C) and determine
which solution is most appropriate for the task.
HCIO
pK₂ = 1.96
C6H5CO₂H
pK₂ = 4.19
C5HẠNH*
pK₂ = 5.25
HBrO
pK₂ = 8.70
HCN
pK₂ = 9.21
C6H5CO₂H and KC6H5CO2
C5H4NHCI and C5H4N
HBrO and KBRO
HCIO and NaCIO
HCN and NaCN
Transcribed Image Text:A chemist needs to buffer a particular solution between pH 3.50 and 4.00 at 25 °C. Consider the pKą values (all at 25 °C) and determine which solution is most appropriate for the task. HCIO pK₂ = 1.96 C6H5CO₂H pK₂ = 4.19 C5HẠNH* pK₂ = 5.25 HBrO pK₂ = 8.70 HCN pK₂ = 9.21 C6H5CO₂H and KC6H5CO2 C5H4NHCI and C5H4N HBrO and KBRO HCIO and NaCIO HCN and NaCN
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