Question 1 2 pts Which of the following acids should be used to prepare a buffer...

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science chemistry

Answer 1

Answer #1

Buffer solution is a mixture of a weak acid and its salt which can resist to mild pH change.

Buffer solution have its ability due to the equilibrium maintained as follows.

ie, HA $\leftrightharpoons$ H+ + A-

And we know,

pH = pKa + log10([A-]/[HA])

As [HA] = [A-], pH = pKa (Since log10 1 =0)

So we need an acid with pKa of ~9.3 to prepare a buffer solution of pH 9.3.

From the Ka values of given acids, pKa values of each are calculated as follows using the equation pKa = -log10 Ka,

pKa of HBrO = 8.638

pKa of CH3COOH = 4.744

pKa of HCOOH = 3.769

pKa of HCN = 9.309

So, from the pKa values of given acids, HCN is having pKa of ~9.309 which can be used to prepare buffer solution of pH 9.3.

Answer 2

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