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14a. Potassium hydrogen phthalate is a solid, monoprotic acid frequently used in the laboratory to standardize...

14a. 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 22.3 mL of a 0.504 M calcium hydroxide solution ?
_______grams KHC8H4O4

14b. 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 0.561 M barium hydroxide solution is needed to exactly neutralize 5.17 grams of KHP ?
_____mL barium hydroxide

14c. 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.
If 2.62 grams of KHP are needed to exactly neutralize 25.9 mL of a potassium hydroxide solution, what is the concentration of the base solution ?
_______M potassium hydroxide

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Expert Solution

14a)

How many grams of KHP are needed to exactly neutralize 22.3 mL of a 0.504 M calcium hydroxide solution ?

molar mass =204.22g/mol

KHP is monobasic acid and Ca(OH)2 is diacidic base .alternativesly [2KHP +Ca(OH)2 ----> Ca(KP)2 + 2H2O]

Thus mmoles of KHP = 2xmmoles of Ca(OH)2

mass of KHP/204.22 = 2x22.3x 10-3L x 0.504

Thus mass of KHP = 4.59 g

14b)

What volume of a 0.561 M barium hydroxide solution is needed to exactly neutralize 5.17 grams of KHP ?

Similar to above relation

5.17g /204.22 g of KHP = 2 x V x 0.562M [ as Ba(OH)2 is also diacidic base]

Thus volume of Ba(OH)2 = 0.0225 L

= 22.52 mL

14c)

If 2.62 grams of KHP are needed to exactly neutralize 25.9 mL of a potassium hydroxide solution, what is the concentration of the base solution ?
_______M potassium hydroxide

KOH is a monoacidic base.

Thus

mmoles of KHP = mmoles of KOH

2.62g/ 204.22g of KHP = 25.9x10-3 LL x M

Thus molarity of KOH = 0.495 M

queen_honey_blossom answered 1 year ago
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