A solution of NaOH was standardized by titration of a known quantity of the primary standard, potassium hydrogen phthalate

The NaOH was then used to find the concentration of an unknown solution of H₂SO₄:

(a) Titration of 0.824 g of potassium hydrogen phthalate required 38.314 g of NaOH solution to reach the end point detected by phenolphthalein indicator. Find the concentration of NaOH (mol NaOH/kg solution).

 (b) A 10.00-mL aliquot of H₂SO₄ solution required 57.911 g of NaOH solution to reach the phenolphthalein end point. Find the molarity of H₂SO₄.

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C3H5O4K + NaOH C3H4O,NaK + H20 Potassium hydrogen phthalate (FM 204.221)