Question
Asked Jan 30, 2020
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9-20. (a) Calculate how many milliliters of 0.100 M HCI
should be added to how many grams of sodium acetate dihy-
drate (NaOAc· 2H2O, FM 118.06) to prepare 250.0 mL of
0.100 M buffer, pH 5.00.
(b) If you mixed what you calculated, the pH would not be
5.00. Describe how you would actually prepare this buffer in
the lab.
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9-20. (a) Calculate how many milliliters of 0.100 M HCI should be added to how many grams of sodium acetate dihy- drate (NaOAc· 2H2O, FM 118.06) to prepare 250.0 mL of 0.100 M buffer, pH 5.00. (b) If you mixed what you calculated, the pH would not be 5.00. Describe how you would actually prepare this buffer in the lab.

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Expert Answer

Step 1

As the volume of the buffer solution is 250 mL, the volume of HCl solution to be added will be 250 mL assuming the addition of sodium acetate does not affect the volume of the solution. The number of moles of HCl present (nHCl) in 250 mL 0.1 M solution is calculated using equation (1) in which n is the number of moles, C is the concentration and V is the volume of solution.

Chemistry homework question answer, step 1, image 1
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Step 2

Consider ‘x’ be the mass of sodium acetate to be added. So, the number of moles of sodium acetate (nNaOAc) is calculated using equation (2) in which n is the number of moles, m is the mass of the substance and M is the molar mass of the substance.

Chemistry homework question answer, step 2, image 1
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Step 3

As HCl reacts with NaOAc to produce acetic acid (AcOH). 0.025 mol of HCl will react with 0.025 mol of NaOAc to produce 0.025 mol of Ac...

Chemistry homework question answer, step 3, image 1
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