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Thread: Calculating Moles questions help

  1. #1 Calculating Moles questions help 
    Som
    Som is offline
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    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


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  3. #2  
    Forum Freshman CLK5's Avatar
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    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.


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