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Sabrina J
Sabrina J asked in Science & MathematicsChemistry · 9 years ago

Organic Chemistry question?

I want to know how I go about answering this question or how to do this question.

Please round to two decimal places:

45.51 mL of anunknown [HCl] solution was titrated to a phenolphthalein endpoint using 36.25 mL of a 0.654 M NaOH solution. What is [HCl]?

*****Thanks

1 Answer

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  • Philippe
    Lv 7
    9 years ago
    Favorite Answer

    Hi Sabrina,

    Ca x Va = Cb x Vb

    HCl is a strong acid . . .

    . . . then : [H3O(+)] = Ca

    Ca x Va = Cb x Vb

    . . . therefore :

    Ca = Cb x Vb / Va

    Ca = 0,654 x 36,25 / 45,51

    Ca = 0,52 mol/L

    I hope to have answered your question.

    .

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