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Math Help - titration

  1. #1
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    titration

    50 ml of a solution containing 1g of each na2co3,nahco3 and naoh was titrated with 1N hcl whal will be the titre readings if

    only phenolphthalein is used as indicator
    only methyl orange used as indicator from very beginning.
    Methyl orange is added after the first end point with phenolphthalein

    i know
    na2co3+hcl=nahco3+nacl
    na2co3+2hcl-2nacl+h20
    naoh+hcl=nacl+h20

    how to use them in this question
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  2. #2
    MHF Contributor Unknown008's Avatar
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    Please, use the correct chemical symbols.

    Phenolphtalein will show the end point when those reactions have taken place:

    NaOH + HCl ---> NaCl + H2O
    NaCO3 + HCl ---> NaHCO3 + HCl

    Methyl orange will show the end-point when those reactions have taken place:

    NaOH + HCL ---> NaCl + H2O
    Na2CO3 + 2HCl ---> 2NaCl + H2O + CO2
    NaHCO3 + HCl ---> NaCl + H2O + CO2

    Phenolphtalein and Methyl Orange one after the other will give you end points when first:

    NaOH + HCl ---> NaCl + H2O
    NaCO3 + HCl ---> NaHCO3 + HCl

    Then;

    NaHCO3 + HCl ---> NaCl + H2O + CO2

    ~~~~~~~~~~~~~~~~

    Can you work from there, all the titre readings?
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