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July 30, 2014

Homework Help: CHEMISTRY

Posted by BRITTANY on Tuesday, February 27, 2007 at 11:12pm.

A BUFFER SOLUTION IS MADE FORM 0.10 MOLES NaF AND 0.25 MOLES OF HF IN 1 LITER OF WATER ----WHAT WILL THE BUFFER CAPACITY BE IF 1.0M HCL IS ADDED -----WHAT IF 2.0 M OF NAOH IS ADDED?? PLEASE HELP I HAVE NO CLUE WHERE TO EVEN BEGIN!!!

Calculate the pH of the solution using the Henderson-Hasslebalch equation.
pH = pKa + log(base)/(acid).

pKa is that of HF.
(base) = 0.1 mol/1 L
(acid) = 0.25 mol/1 L

Now, buffer capacity is the number of mols of strong acid or strong base that can be added to 1.00 L of the buffer which will cause a 1.00 unit change in pH. Therefore, how much 1.0 M HCl (in mols) can be added to change the pH by 1.00 unit. Same for NaOH. I will leave that for you. Post your work if you require further assistance.

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