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 28.9 mL of a 0.100 M sodium hydroxide solution ?

_________grams KHC₈H₄O₄

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 0.501 M sodium hydroxide solution is needed to exactly neutralize 3.50 grams of KHP ?

________mL sodium hydroxide

Answer 1

Ans 1 :

An equimolar amounts of both the reagents are used in the reaction to react completely.

Number of moles of NaOH = 0.0289 x 0.100 = 0.00289 mol

So number of moles of KHP will also be 0.00289 mol

Mass of KHP = 0.00289 x 204.22 = 0.59 grams

Ans 2 :

Number of moles of KHP = 3.50 / 204.22 = 0.0171 mol

So number of moles of NaOH also will be 0.0171 mol

Volume = Number of moles / molarity

V = 0.0171 / 0.501

= 0.0342 L

or 34.2 mL sodium hydroxide