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1 The solubility of phthalic acid in water varies greatly with temperature. At 14°C, the solubility of phthalic acid is 0.54 g/100 mL of solvent. At 99°C, the solubility is 18.0 g/100 mL. How many mL of boiling water are required to dissolve 25 g of phthalic acid? If the solution is cooled to 14°C, how many grams of phthalic acid would crystallize out?

1 The solubility of phthalic acid in water varies greatly with temperature. At 14°C, the solubility of phthalic acid is 0.54 g/100 mL of solvent. At 99°C, the solubility is 18.0 g/100 mL. How many mL of boiling water are required to dissolve 25 g of phthalic acid? If the solution is cooled to 14°C, how many grams of phthalic acid would crystallize out?

Chemistry
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
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1 The solubility of phthalic acid in water varies greatly with temperature. At 14°C, the solubility of phthalic acid is 0.54 g/100 mL of solvent. At 99°C, the solubility is 18.0 g/100 mL. How many mL of boiling water are required to dissolve 25 g of phthalic acid? If the solution is cooled to 14°C, how many grams of phthalic acid would crystallize out? 2 10.0 g of compound A is contaminated with 0.2 g of compound B. Both compounds are soluble in water and the solubilities of the two are as follows: 4 Compound Solubility at 20°C (g/10 mL water) Solubility at 100°C (g/ 10 mL water) A 0.686 B 6.67 a 0.029 0.22 What volume of water will be needed to dissolve 10.0g of A at 100°C? b How much of compound A will crystallize out on cooling to 20°C? C Will any crystals of B form? Show calculations to explain your answers to these questions. 3 An unknown compound is suspected to be benzoic acid (mp 121.5-122°C). What would be the effect on the melting point if some of this unknown substance was mixed with (a) pure benzoic acid; (b) acetanilide (mp 113.5-114°C)? Three samples, labeled 1, 2, and 3, contain substances that have similar melting points. How could you prove, using melting points, that these three substances are not the same?
Transcribed Image Text:1 The solubility of phthalic acid in water varies greatly with temperature. At 14°C, the solubility of phthalic acid is 0.54 g/100 mL of solvent. At 99°C, the solubility is 18.0 g/100 mL. How many mL of boiling water are required to dissolve 25 g of phthalic acid? If the solution is cooled to 14°C, how many grams of phthalic acid would crystallize out? 2 10.0 g of compound A is contaminated with 0.2 g of compound B. Both compounds are soluble in water and the solubilities of the two are as follows: 4 Compound Solubility at 20°C (g/10 mL water) Solubility at 100°C (g/ 10 mL water) A 0.686 B 6.67 a 0.029 0.22 What volume of water will be needed to dissolve 10.0g of A at 100°C? b How much of compound A will crystallize out on cooling to 20°C? C Will any crystals of B form? Show calculations to explain your answers to these questions. 3 An unknown compound is suspected to be benzoic acid (mp 121.5-122°C). What would be the effect on the melting point if some of this unknown substance was mixed with (a) pure benzoic acid; (b) acetanilide (mp 113.5-114°C)? Three samples, labeled 1, 2, and 3, contain substances that have similar melting points. How could you prove, using melting points, that these three substances are not the same?
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