What is the equivalent weight of: (a) Potassium tetraoxalate, KHC2O4•H2C2O4•2H2O, if the complete neutralization is assumed. (b) Sodium carbonate if it is titrated to the phenolphthalein end point with HCl. The reaction is Na2CO3 + HCl = NaCl + NaHCO3. (c) Sodium tetraborate decahydrate if the titration reaction is Na2 B4O7•10H2O + 2H+ + H2O = 4HBO2 + 2Na+? (d) Na3PO4•12H2O if it is titrated with phenolphthalein as an indicator to form HPO42-?

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  1. a. molar mass KHC2O4•H2C2O4•2H2O/3 = ?
    b. molar mass Na2CO3/1 = ?
    c. molar mass Na2 B4O7•10H2O /2 = ?
    d. molar mass Na3PO4•12H2O/2 = ?

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