Stu Dent and Doc Inmaking test the acid buffer capacity of their acetic acid – a

Question

Stu Dent and Doc Inmaking test the acid buffer capacity of their acetic acid – acetate buffer. Help them with their acid buffer capacity calculations. Here is the data for the acid capacity experiment:

25.0 mL of acetic acid – acetate buffer, measured with a pipet

Initial pH = 4.57

5.74 mL of 0.0300 M HCl added, measured using a buret

Final pH = 4.24

Calculate the moles of HCl added to the buffer. (Answer in decimal format with 3 significant figures and units of mol) ?

Calculate the acid buffer capacity of the buffer using moles of HCl per liter of buffer. (Answer in decimal format with 3 significant figures and units of mol/L) ?

Explanation / Answer

Moles of acid added to buffer = 0.03*0.00574 = 0.0001722 moles

Acid buffer capacity = moles of acid added to a liter of solution / change in pH

Now, 0.0001722 moles are added to 0.025 L of buffer solution.

So, moles added to 1 L buffer solution = 0.006888

So, Acid buffer capacity = 0.006888/(4.57-4.24) = 0.0208 mol/L

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