Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the

Question

Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP.

How many grams of KHP are needed to exactly neutralize 31.9 mL of a 0.149 M barium hydroxide solution ?

_________grams KHC8H4O4

2)Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize strong base solutions. It has the unwieldy formula of KHC8H4O4. This is often written in shorthand notation as KHP.

What volume of a 0.550 M barium hydroxide solution is needed to exactly neutralize 8.37 grams of KHP ?

________mL barium hydroxide

Explanation / Answer

1)

Answer

1.9414g

Explanation

No of miles of Barium hydroxide = (0.149mol/1000ml)×31.9ml = 0.0047531

reaction between KHP and Ba(OH)2 is

2KHP + Ba(OH)2 ------> Ba(KP)2 + 2H2O

stoichiometrically, 1mole of Ba(OH)2 react with 2 moles of KOH

Therefore,

No of mole of KHP required = 0.0047531mol×2 =0.0095062

Molar mass of KHP = 204.22g/mol

Mass of KHP required = 204.22g/mol × 0.0095062mol = 1.9414g

2)

Answer

37.26ml

Explanation

No of moles of KHP = 8.37g/204.22g/mol = 0.04099

0.04099 moles of KHP react with 0.020495moles of Ba(OH)2

Volume of Ba(OH)2 required =(1000ml/0.550mol)×0.020495ml = 37.26ml

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