Question

A student is asked to standardize a solution of calcium hydroxide. He weighs out 0.925 g...

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?

Homework Answers

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

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
A student is asked to standardize a solution of calcium hydroxide. He weighs out 0.988 g...
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...
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...
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...
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...
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...
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...
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...
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...
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...
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...