Use the References to access important values if needed for this question.A student is asked to standardize a solution of calcium hydroxide. He weighs out 1.05 g potassium hydrogen phthalate(KHC8H4O4, treat this as a monoprotic acid).It requires 39.1 mL of calcium hydroxide to reach the endpoint.МA. What is the molarity of the calcium hydroxide solution? 0.001This calcium hydroxide solution is then used to titrate an unknown solution of hydrochloric acid.B. If 16.6 mLof the calcium hydroxide solution is required to neutralize 28.0 mL of hydrochloric acid, what is the molarityМof the hydrochloric acid solution? 0.039

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Asked Oct 15, 2019
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Use the References to access important values if needed for this question.
A student is asked to standardize a solution of calcium hydroxide. He weighs out 1.05 g potassium hydrogen phthalate
(KHC8H4O4, treat this as a monoprotic acid).
It requires 39.1 mL of calcium hydroxide to reach the endpoint.
М
A. What is the molarity of the calcium hydroxide solution? 0.001
This calcium hydroxide solution is then used to titrate an unknown solution of hydrochloric acid.
B. If 16.6 mLof the calcium hydroxide solution is required to neutralize 28.0 mL of hydrochloric acid, what is the molarity
М
of the hydrochloric acid solution? 0.039
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Use the References to access important values if needed for this question. A student is asked to standardize a solution of calcium hydroxide. He weighs out 1.05 g potassium hydrogen phthalate (KHC8H4O4, treat this as a monoprotic acid). It requires 39.1 mL of calcium hydroxide to reach the endpoint. М A. What is the molarity of the calcium hydroxide solution? 0.001 This calcium hydroxide solution is then used to titrate an unknown solution of hydrochloric acid. B. If 16.6 mLof the calcium hydroxide solution is required to neutralize 28.0 mL of hydrochloric acid, what is the molarity М of the hydrochloric acid solution? 0.039

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Expert Answer

Step 1

(A ) The balanced neutralization reaction is given below.

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2КНC,Н,О, +Са(ОН), > SaltWater

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Step 2

It can be stated that 1 mole of Calcium hydroxide is required to completely neutralize 2 moles of the acid.

Actual moles of Calcium hydroxide and potassium hydrogen phthalate can be calculated as shown below.

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mass Actualmoles of KHC,H O Molar mass 1.05g 204.22g/mol - 5.1415 x103 mol 1 Actualmoles of Ca(OH) x5.1415x10 mol 2 -2.57075 x103mol Volume of Calcium hydroxide is 39.1mL. Thus the molarity of Calcium hydroxide solution can be calculated as given below Number of moles of Ca(OH) Molarity of Ca(OH) Volume in L 2.57075 x103 mol IL 39.1mL x 1000mL 0.06575M Thus, the molarity of Calcium hydroxide solution is 0.06575 M

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Step 3

(B) The balanced neutralization ...

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2HC1 Ca (OH), »Salt + Water

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