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    Nargis786's Avatar
    Nargis786 Posts: 177, Reputation: 1
    Junior Member
    		  
    #1

    Jun 19, 2009, 11:55 AM
    analysing the compounds & calculating %yield & %purity 3
    titration results:

    Experiment: Trial 1 Trial 2 Trial 3 Trial 4
    Initial: 0 0 0 0
    Final: 2460 2430 2430 2430
    Volume used: 2460 2430 2430 2430

    formula:

    CAVA divide by CBVB = a divide by b

    CAVA x b = CBVB x a

    CAVA x b divide by VB x a = CB

    QUESTION:
    CALCULATE BY USING THIS FORMULA
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #2

    Jun 19, 2009, 11:58 AM

    I'm afraid you haven't supplied the required information...

    What do we have to calculate?
    Nargis786's Avatar
    Nargis786 Posts: 177, Reputation: 1
    Junior Member
    		  
    #3

    Jun 19, 2009, 02:27 PM
    Quote Originally Posted by Unknown008 View Post
    I'm afraid you haven't supplied the required information...

    What do we have to calculate?
    We have to calculate the mole
    Perito's Avatar
    Perito Posts: 3,139, Reputation: 150
    Ultra Member
    		  
    #4

    Jun 19, 2009, 02:36 PM
    Quote Originally Posted by Nargis786 View Post
    titration results:

    Experiment: Trial 1 Trial 2 Trial 3 Trial 4
    Initial: 0 0 0 0
    Final: 2460 2430 2430 2430
    Volume used: 2460 2430 2430 2430

    formula:

    CAVA divide by CBVB = a divide by b

    CAVA x b = CBVB x a

    CAVA x b divide by VB x a = CB

    QUESTION:
    CALCULATE BY USING THIS FORMULA

    ...
    we have to calculate the mole
    That's great. You need to calculate the number of moles of something but you haven't given us the data to do the calculations. If this is all the data you took, you're going to flunk. Guaranteed.

    We know the volume used, and some weird formula, but we don't know what CAVA or CBVB is or b or a or VB. We have no idea what the substance is or the concentrations of the titrant, etc. In short you haven't provided sufficient information to calculate the number of moles.

    What did you titrate with? What was the titrant's concentration (moles/Liter)? What were the weights of the starting samples? What is the equation for the reaction? You need all of that to do what you ask.
    Unknown008's Avatar
    Unknown008 Posts: 8,076, Reputation: 723
    Uber Member
    		  
    #5

    Jun 19, 2009, 08:16 PM

    For the fweird formula part, I think I guessed what was it:



    I bet C_A is the concentration of A, V_A the volume of A and a the number of moles of A. And that's the same thing for the 'B's.

    However, Nargis786, to calculate, we need numbers!

    (are you by any chance in India?)
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