Question

35.00 mL of unknown calcium hydroxide solution is titrated with 0.250 M standard nitric acid solution. if 40.09 mL of the standard acid solution is required to reach a phenolphthalein endpoint, what is the molarity of the unknown calcium hydroxide solution? write the balanced formula unit equation.

Answer #1

The reaction is,

Ca(OH)2 + 2HNO3 ---> Ca(NO3)2 + 2H2O

According to the stoichiometry of the reaction 1 mole of Ca(OH)2 reacts with 2 moles of HNO3 to reach endpoint

Given,

Volume of Ca(OH)2 solution = 35 mL = 0.035 L

Volume of HNO3 solution = 40.09 mL = 0.04009 L

Molarity of HNO3 olution = 0.25 M

=> Moles of HNO3 = 0.25 x 0.04009 = 0.0100225 moles

=> Moles of Ca(OH)2 needed = 0.0100225 / 2 = 5.01125 x 10^-3 moles

Moles = Molarity x Volume (L)

=> 5.01125 x 10^-3 = Molarity (Ca(OH)2) x 0.035

=> **Molarity (Ca(OH)2) = 0.143 M**

57.8 mL of 0.993 M hydroiodic acid is added to 37.4 mL of
calcium hydroxide, and the resulting solution is found to be
acidic. 15.4 mL of 2.61 M potassium hydroxide is required to reach
neutrality. What is the molarity of the original calcium hydroxide
solution?
40.5 mL of 1.46 M nitric acid is added to 34.3 mL of sodium
hydroxide, and the resulting solution is found to be acidic. 27.8
mL of 0.669 M calcium hydroxide is required to...

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 5.00-mL sample of nitric acid required 13.25 mL of 0.0842 M
strontium hydroxide for titration. Calculate the molarity of the
acid solution. (Hint: It's stoichiometry, you need the balanced
equation)

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 0.925 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,...

Answer question 9a and 9b
using the reaction equation between nitric acid reacts with
magnesium hydroxide.
2 HNO3(aq) + Mg(OH)2(aq) →Mg(NO3)2(aq) + 2 H2O (aq)
9a. A 35.00 mL of sample of nitric acid
solution is required to neutralized 20.0 mL of 0.550 M magnesium
hydroxide solution. Calculate the molarity of the nitric acid
solution.
9b. If 50.0 mL of 0.250 M nitric acid solution
is reacted with 25.0 mL of 0.550 M of magnesium hydroxide solution,
then many molecules...

A. A 11.3 g sample of an aqueous solution of
hydrobromic acid contains an unknown amount of the
acid.
If 12.8 mL of 0.122 M
barium hydroxide are required to neutralize the
hydrobromic acid, what is the percent by mass
ofhydrobromic acid in the mixture?
= % by mass
B. A 10.4 g sample of an aqueous solution of
nitric acid contains an unknown amount of the
acid.
If 25.9 mL of 0.403 M
barium hydroxide are required to neutralize...

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...

38.0 mL of 1.20 M perchloric acid is added to 16.9 mL of sodium
hydroxide, and the resulting solution is found to be acidic. 15.9
mL of 0.950 M calcium hydroxide is required to reach neutrality.
What is the molarity of the original sodium hydroxide solution?
_____ M

ADVERTISEMENT

Get Answers For Free

Most questions answered within 1 hours.

ADVERTISEMENT

asked 14 minutes ago

asked 23 minutes ago

asked 23 minutes ago

asked 23 minutes ago

asked 30 minutes ago

asked 30 minutes ago

asked 40 minutes ago

asked 42 minutes ago

asked 42 minutes ago

asked 56 minutes ago

asked 1 hour ago

asked 1 hour ago