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What volume in mL of 0.0985 M sodium hydroxide solution is required to reach the equivalence point in the complete titration of a 15 mL sample of 0.124 M phosphoric acid?

  • chemistry -

    H3PO4 + 3NaOH ==> 3H2O + Na3PO4
    mols H3PO4 = M x L = ?
    Using the coefficients in the balanced equation, convert mols H3PO4 to mols NaOH. That is mols H3PO4 x 3 = mols NaOH.

    Now M NaOH = mols NaOH/L NaOH. YOu know M and mols, solve for L NaOH and convert to mL.

  • chemistry -

    35.7 mL

  • chemistry -

    15mL x(1L/1000mL)x(0.124mols/mol)x (3molNaOH/1molH3PO4)(1L/0.0985mol)x1000mL/1L= 56.6mL

    dont cancel out the L to mL conversion just do this step by step, if its wrong correct me idk how it would be wrong tho i did exactly what the book did

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