# 9-20. (a) Calculate how many milliliters of 0.100 M HCIshould be added to how many grams of sodium acetate dihy-drate (NaOAc· 2H2O, FM 118.06) to prepare 250.0 mL of0.100 M buffer, pH 5.00.(b) If you mixed what you calculated, the pH would not be5.00. Describe how you would actually prepare this buffer inthe lab.

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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.

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.

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...

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