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 27.8 mL of a 0.133 M sodium hydroxide solution ?

Part I) ANSWER: _______ grams KHC8H4O4

What volume of a 0.533 M sodium hydroxide solution is needed to exactly neutralize 3.61 grams of KHP ?

Part II) ANSWER: ________ mL sodium hydroxide

Explanation / Answer

KHP + NaOH = KNaC8H4O4 + H2O

As per the above balanced reaction, KHP & NaOH reacts in the mole ratio of 1:1

Thus, moles of NaOH = molarity of NaOH solution *volume of solution in litres = 0.133*0.0278 = 0.0036974

Thus, moles of KHP required = moles of NaOH = 0.0036974

Molar mass of KHP = 204 g/mole

Thus, mass of KHP required = moles*molar mass = 0.754 g............(1)

Moles of KHP in 3.61 g of it = mass/molar mass = 3.61/204 = 0.0177

Thus, moles of NaOH required = moles of KHP = 0.0177

Now, volume of NaOH solution required = moles/molarity = 0.0177/0.533 = 0.0332 litres = 33.2 ml..............(2)

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