1)Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in th
ID: 1087355 • Letter: 1
Question
1)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 27.9 mL of a 0.570 M sodium 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 0.217 M barium hydroxide solution is needed to exactly neutralize 3.04 grams of KHP ?
ANSWER: mL barium hydroxide
Explanation / Answer
1) Neutralization reaction is
NaOH + KHP ...............> NaKP + H2O.
one mole KHP neutralize the one mole NaOH.
27.9 mL of a 0.570 M sodium hydroxide solution = 0.0279 * 0.570 = 0.0159 mole.
so moles of KHP needed = 0.0159 mole
molar mass of KHP is 204.22 gm / mole.
grams of KHP are needed = 0.0159 * 204.22 = 3.25 gm KHP (answer)
2)
reaction is
Ba(OH)2 + 2 KHP ...............> Ba(KP)2 + 2 H2O
one mole Ba(OH)2 is neutralize by two mole KHP.
3.04 grams of KHP = mass / molar mass = 3.04 / 204.22 = 0.0149 mole
moles of Ba(OH)2 needed = 0.0149 / 2 = 7.45 * 10^-3 mole.
volume of Ba(OH)2 needed = 1000 * 7.45 * 10^-3 / 0.217 = 34.3 ml (answer)
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