Potassium hydrogen phthalate KHC8H4O4 is used to standardizasolution of bases. t

Question

Potassium hydrogen phthalate KHC8H4O4 is used to standardizasolution of bases. the acidic anion reacts with stonge basesaccording to the following net inonic equ. HC8H4O4- (aq) + OH- (aq)-------> C8H4O4-2 ( aq) + H2O (l) if a .902 g sample of ptassium hydrogen phthalate is dissolvedin water and titrated to the equivalence point with 26.45 mL ofNaOH . what is the molar comcentration of the NaOH Potassium hydrogen phthalate KHC8H4O4 is used to standardizasolution of bases. the acidic anion reacts with stonge basesaccording to the following net inonic equ. HC8H4O4- (aq) + OH- (aq)-------> C8H4O4-2 ( aq) + H2O (l) if a .902 g sample of ptassium hydrogen phthalate is dissolvedin water and titrated to the equivalence point with 26.45 mL ofNaOH . what is the molar comcentration of the NaOH

Explanation / Answer

HC8H4O4- (aq) + OH- (aq)-------> C8H4O4-2 ( aq) + H2O (l)
No. of moles of potassium phthalate , n = mass / molar mass Molar mass of potassium phthalate , M = 39 + 1 + 8 * 12 + 4 *1 + 4 * 16 = 204 g So , n = 0.902 g / 204 g           =0.00442 moles 1 mole of potassium phthalate requires 1 mole of NaOH 0.00442 moles of potassium phthalaterequires 0.00442 moles of NaOH No. of moles of NaOH , n ' = Molarity * Volume in L Molarity = 0.00442 moles / 0.02645 L              = 0.1671 M

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