Question

A student is asked to standardize a solution of calcium hydroxide. He weighs out 0.925 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 28.3 mL of calcium hydroxide to reach the endpoint.

A. What is the molarity of the calcium hydroxide solution? This calcium hydroxide solution is then used to titrate an unknown solution of hydroiodic acid.

B. If 13.3 mL of the calcium hydroxide solution is required to neutralize 29.9 mL of hydroiodic acid, what is the molarity of the hydroiodic acid solution?

Answer #1

KHC8H4O4 has only one acidic proton

2HA + Ca[OH]2 ------> CaA2 + 2H2O

2 mole of HA can be neutralised by 1 mole of Ca[OH]2

MOles of KHC8H4O4 = mass/ molar mass = 0.00453

0.00453 moles of HA is neutralised by ==> 0.00453/2 = 0.002265 moles of Ca[OH]2

A] Moles = Molarity*V in L

M = 0.002265 / 28.3 = 0.08 M

B] 2HI + Ca [OH]2 -----> CaI2 + 2H2O

2 moles of HI neutralised by 1 mole of Ca[OH]2

13.3*0.08 = 1.064 millimoles of Ca[OH]2 can neutralize ==== > 1.064*2 = 2.128 milli moles of HI

MV = 2.128

M = 2.128 / 29.9 = 0.07117 M

A student is asked to standardize a solution of calcium
hydroxide. He weighs out 0.988 g potassium hydrogen phthalate
(KHC8H4O4, treat this as a monoprotic acid). It requires 18.7 mL of
calcium hydroxide to reach the endpoint.
A. What is the molarity of the calcium hydroxide solution? This
calcium hydroxide solution is then used to titrate an unknown
solution of hydroiodic acid.
B. If 12.7 mL of the calcium hydroxide solution is required to
neutralize 14.9 mL of hydroiodic acid,...

A student is asked to standardize a solution of calcium
hydroxide. He weighs out 0.905 g potassium hydrogen phthalate
(KHC8H4O4, treat this as a monoprotic acid). It requires 31.0 mL of
calcium hydroxide to reach the endpoint.
A. What is the molarity of the calcium hydroxide solution?
This calcium hydroxide solution is then used to titrate an
unknown solution of hydrochloric acid.
B. If 25.0 mL of the calcium hydroxide solution is required to
neutralize 19.3 mL of hydrochloric acid,...

A student is asked to standardize a solution of calcium
hydroxide. He weighs out 0.921g potassium
hydrogen phthalate (KHC8H4O4,
treat this as a monoprotic acid).
It requires 17.3 mL of calcium
hydroxide to reach the endpoint.
A. What is the molarity of thecalcium
hydroxide solution?
M=?
his calcium hydroxidesolution is then used to
titrate an unknown solution ofhydrobromic
acid.
B. If 19.5 mL of the
calcium hydroxide solution is required to
neutralize 14.2 mL ofhydrobromic
acid, what is the molarity...

A student is asked to standardize a solution of barium
hydroxide. He weighs out 0.925 g potassium hydrogen phthalate
(KHC8H4O4, treat this as a monoprotic acid). It requires 28.5 mL of
barium hydroxide to reach the endpoint.
A. What is the molarity of the barium hydroxide solution? This
barium hydroxide solution is then used to titrate an unknown
solution of perchloric acid.
B. If 26.0 mL of the barium hydroxide solution is required to
neutralize 26.9 mL of perchloric acid,...

A student is asked to standardize a solution of
potassium hydroxide. He weighs out
0.950 g potassium hydrogen phthalate
(KHC8H4O4, treat this as a
monoprotic acid).
It requires 31.8 mL of potassium
hydroxide to reach the endpoint.
A. What is the molarity of the potassium
hydroxide solution? M
This potassium hydroxide solution is then used to
titrate an unknown solution of perchloric
acid.
B. If 16.7 mL of the
potassium hydroxide solution is required to
neutralize 27.5 mL of perchloric
acid,...

1. A student is asked to standardize a solution of
sodium hydroxide. He weighs out
0.939 g potassium hydrogen phthalate
(KHC8H4O4, treat this as a
monoprotic acid).
It requires 27.5 mL of sodium
hydroxide to reach the endpoint.
A. What is the molarity of the sodium
hydroxide solution? ______M
This sodium hydroxide solution is then used to
titrate an unknown solution of hydrobromic
acid.
B. If 14.7 mL of the
sodium hydroxide solution is required to
neutralize 23.4 mL ofhydrobromic...

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 32.0 mL of a 0.332 M calcium hydroxide
solution ?
What volume of a 0.232 M calcium hydroxide solution is needed to
exactly neutralize 3.54 grams of KHP ?

You are going to standardize your sodium hydroxide by titrating
with potassium hydrogen phthalate. As an example, you dissolve
0.3365 g of potassium hydrogen phthalate, otherwise known as KHP
(KHC8H4O4) in water in a 250.0 mL Erlenmeyer flask and then add
phenolphthalein indicator. You then titrate with your sodium
hydroxide solution, which is in a buret, and you determine that the
equivalence point is at 12.44 mL of your sodium hydroxide solution.
Determine the molarity of your sodium hydroxide solution....

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
1. How many grams of KHP are needed to exactly neutralize 36.8
mL of a 0.337 M sodium hydroxide solution ?
2. What volume of a 0.381 M barium hydroxide solution is needed
to exactly neutralize 5.80 grams of KHP ?
3. If 4.19 grams of...

To standardize a solution of NaOH, one uses a primary standard
called potassium hydrogen phthalate. It is a monoproctic acid that
can be obtained extremely pure and dried to a constant weight. It
has a molar mass of 204.33 g/mol. suppose you weigh out 0.556 g of
KHP and dissolve it in water. It requires 14.48 mL of NaOH solution
to reach the endpoint. What is the concentration of the NaOH
solution?
The NaOH solution from above is used to...

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 19 minutes ago

asked 35 minutes ago

asked 43 minutes ago

asked 43 minutes ago

asked 49 minutes ago

asked 49 minutes ago

asked 55 minutes ago

asked 1 hour ago

asked 1 hour ago

asked 1 hour ago

asked 2 hours ago

asked 2 hours ago