Potassium hydrogen phthalate, KHCgH404, Is used to standardize solutions of base

Question

Potassium hydrogen phthalate, KHCgH404, Is used to standardize solutions of base es. The acidic anion reacts with strong bases according to the following net ionic equation: HCyH4Og-(aq) + OH-(aq) CyH4Og2-(aq) + H2O() ta0.841-g sample of potassium hydrogen phthalate is dissolved in water and trated to the equivalenoe point with 36.80 m of NaOH(awhat is the molar concentration of the Na0H? B IH 50.00 ml of the NaOHag) solution is added to an empty beaker and Strated to the equivalence point with 58 59 mL of Hil(ag what is the molar concentration of the H

Explanation / Answer

a) KHP moles = mass of KHP / ( molar mass of KHP)

= ( 0.841g) / ( 204.2g/mol) = 0.00412 mol

as per reaction NaOH moles needed to react with KHP = 0.00412 ( since kHP and NaOH react in 1:1 ratio)

volume fo NaOH used = 35.8ml = 0.0358 L

Molarity of NaOH = ( moles of NaOH) / ( volume of NaOH solution ) = ( 0.00412mol) / ( 0.0358L)

= 0.115 M

B) HI and NaOH react in 1:1 ratio

hence M x V of HI = M x V of NaOH

M x 58.59 = 0.115 x 50

M of HI = 0.09818 M

Thus molarity fo HI = 0.09818 M

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