Chemistry

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A 23.16 ml volume of an H2A acid solution of unknown concentration with 2 drops of phenolphthalein required 14.24 ml of 0.135 M NaOH to reach the endpoint. What is the molar concentration of the acid solution?

  • Chemistry -

    H2A + 2NaOH ==> Na2A + 2H2O

    mols NaOH = M x L = ?
    Convert mols NaOH to mols H2A using the coefficients in the balanced equation. So mols H2A = 1/2 mols NaOH

    Then M H2A = mols H2A/L H2A

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