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How many mL of .150 M sodium hydroxide is required to neutralize 25 mL of .125 M of phosphoric acid?

  • Chemistry -

    How many mL of a .10 M NaOH solution are needed to neutralize 15 mL of .20 M H3PO4 solution?


    Write nbalanced equation:
    3NaOH + H3PO4 → Na3PO4 + 3H2O
    3mol NaOH recat with 1mol H3PO4

    In all these titration questions, do it the simple way: Use the following equation:

    Ma*Va/na = Mb*Vb/nb
    Where:
    Ma = molarity of acid
    Va = volume of acid
    na = number of moles acid used, from the balanced equation
    Mb = molarity of base
    Vb = volume of base
    nb = number of moles of base used, from the balanced equation:
    substitute:
    0.20*15/1 = 0.10*Vb/3
    Vb = 0.20*15*3 /0.10
    Vb = 90ml

    The correct answer is : volume of 0.10NaOH required = 90ml.

    ___________________________________

    Similar problem, different concentrations, volumes, etc.

    Just try it yourself! :)

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