Thread: Calculating Moles questions help

Hi I need some help with a question on my revision sheet:

5. Calculate the amount (number of moles) of acid needed to overcome buffers found in samples of your solutions using data from your pH experiment.


Added a drop of 0.05 M HCl to seawater, stirred and recorded the pH. Repeated until 15 drops

My results:

Drops	0	1	2	3	4	5	6	7	8	9	10	11	12	13	14	15
Acid	8.5	8.5	8.5	8	7.5	7	7	6.5	6.5	6	6	6	5.5	5.5	5	4

I have no clue what to do to figure out the number of Moles other than the buffering system breaks at 7 drops in (I think)
Any help would be awesome, thanks

Each drop from a pipette should be approximately 0.05mL. From there you could calculate moles by rearranging the formula C=n/V to get n=CV as the guy above me said.