My question is how do Calculate the buffer capacitity (NaOH moles) for buffer an
ID: 526310 • Letter: M
Question
My question is how do Calculate the buffer capacitity (NaOH moles) for buffer and diluted buffer? These are the results from my buffer study lab and i'm usure how to solve this, I am not sure what goes where in the pH=pka - log(nHA/nA-) please help!!.
Thank you
Data Sheet Moles of acetic acid contained in 50.0 mL of a Mass of sodium acetate needed to equalize the 0.10 M sample solution boos males moles of acetic acid in sample solution 6.LI Buffer pH Study Buffer Sample solution initial pH: Calculated buffer capacity (moles NaOH): pH after addition of 0.100 M NaOH pH after addition of 0.100 M HCl Total volume added pH Total volume added pH 1.00 mL 1.00 mL 2.00 mL 2.00 mL PA doos 3.00 mL 3.00 mL 4.00 mL 4.00 mL 5.00 mL 5.00 mL Diluted Buffer Sample solution initial pH: Calculated buffer capacity (moles NaOH): pH after addition of 0.100 M HCl pH after addition of 0.100 M NaOH Total volume added Total volume added 1.00 mL 1.00 mL 2.00 mL 2.00 mL 3.00 mL 3.00 mL 4.00 mL 4.00 mL 5.00 mL. 5.00 mL 3,33 pH after addition of 1.0 mL NaoH: llsl Initial pH of unbuffered HCI:Explanation / Answer
The buffer capactity refers to the maximum amount of either strong acid or strong base that can be added before a significant change in the pH will occur. This is simply a matter of stoichiometry. The maximum amount of strong acid that can be added is equal to the amount of conjugate base present in the buffer. The maximum amount of base that can be added is equal to the amount of weak acid present in the buffer.
when NaOH is added, it reacts with acetic acid to convert it to sodium acetate
maximum amount of NaOH that can be added = moles of acetic acid = 0.005 moles
Buffer capacity (moles of NaOH) = 0.005 moles
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Similarly calculate number of moles of acetic acid in diluted solution. Total concentration of acetic acid is the buffer capacity.
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