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12 Nov 2019

calculate the concentration of acetic acid and acetate ion in a .2M acetate buffer at pH 5. The pKa of acetic acid is 4.76.

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Bunny Greenfelder
Bunny GreenfelderLv2
20 May 2019

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Related questions

Calculate the pH of an acetate buffer pka= 4.76 if there is three times as many moles of acetic acid as acetate ion. Please show work.

What are the concentrations of acetic acid (pKa=4.76) and acetate in 0.15M acetate buffer, pH=5.7?

What concentrations of acetic acid (pKa=4.76) and acetate would be required to prepare a 0.15 M buffer solution at pH 4.9 ?

Strategy

Rearrange the Henderson–Hasselbalch equation to solve for the ratio of base (acetate) to acid (acetic acid), [A?]/[HA] .

Use the mole fraction of acetate to calculate the concentration of acetate.

Calculate the concentration of acetic acid.

Step 1: The ratio of base to acid is 1.4.

Step 2: The mole fraction of acetate is 0.58, and the concentration of acetate is 0.087.

Step 3: Calculate the concentration of acetic acid.

That is, there are 1.4 molecules of acetate for each molecule of acetic acid.

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