I have a 1.2864g sample of maleic acid which was dissolved in enough water to make 100.0 mL of a solution. Then 10.0 mL of the solution was titrated to a phenolphthalein endpoint with 29.39 mL of an unknown sodium hydroxide solution. What is the molarity of the sodium hydroxide solution?

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Asked Oct 17, 2019
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I have a 1.2864g sample of maleic acid which was dissolved in enough water to make 100.0 mL of a solution. Then 10.0 mL of the solution was titrated to a phenolphthalein endpoint with 29.39 mL of an unknown sodium hydroxide solution. What is the molarity of the sodium hydroxide solution?

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Expert Answer

Step 1

The number of moles of maleic acid present in 10.0mL of solution can be calculated as

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mass Totalmoles of maleicacid=- molar mass 1.2864g 116.1g/mol 0.01108mol 10.0mL moles of maleicacidin10.0 mL of solution 0.01108 molx- 100mL -0.001108 mol

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Step 2

Moles of sodium hydroxide react...

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H2C H2O+2 NaOH-Na CH20+2H,0 1molmaleicacidreacts with 2 mol NaOH 2mol NaOH molesof NaOH 0.001 108 mol maleicacid> 1molmaleicacid 0.00221 mol NaOH

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