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A solution of Ca(OH)2 (FM = 74.09) was used in determining the equivalent weight of an unknown acid. To do so, the said solution was standardized against 0.1235 g KHP (FM = 204.22), requiring 7.45 mL to reach the phenolphthalein endpoint. On the other hand, a 0.0543 g unknown acid requires 12.85 mL standard Ca(OH)2 to reach the desired endpoint. a. Calculate the standard normality of Ca(OH)2. b. Calculate the equivalent weight of the unknown acid. c. From the information in the table, what is the most probable identity of the unknown acid?

A solution of Ca(OH)2 (FM = 74.09) was used in determining the equivalent weight of an unknown acid. To do so, the said solution was standardized against 0.1235 g KHP (FM = 204.22), requiring 7.45 mL to reach the phenolphthalein endpoint. On the other hand, a 0.0543 g unknown acid requires 12.85 mL standard Ca(OH)2 to reach the desired endpoint. a. Calculate the standard normality of Ca(OH)2. b. Calculate the equivalent weight of the unknown acid. c. From the information in the table, what is the most probable identity of the unknown acid?

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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A solution of Ca(OH)2 (FM = 74.09) was used in determining the equivalent weight of an unknown acid. To do so, the said solution was standardized against 0.1235 g KHP (FM = 204.22), requiring 7.45 mL to reach the phenolphthalein endpoint. On the other hand, a 0.0543 g unknown acid requires 12.85 mL standard Ca(OH)2 to reach the desired endpoint.
a. Calculate the standard normality of Ca(OH)2.
b. Calculate the equivalent weight of the unknown acid.
c. From the information in the table, what is the most probable identity of the unknown acid?

a. Calculate the standard normality of Ca(OH)2. b. Calculate the equivalent weight of the unknown acid. c. From the table below, what is the most probable identity of the unknown acid. Formula weight Probable identity Ascorbic Acid, C6H§O6 Malonic Acid, C3H4O4 Succinic Acid, CH6O4 Citric Acid, C6H;O7 Proticity 1 176.124 104.062 2 2 118.088 192.124 3 n wanted to determine the protein content of his blood. To do so, he obtained 1.00 mL plood, and diluted it to 10.00 mL. From that solution, he subjected 1.00 mL to Kjeldahl ilysis. After digestion, the liberated NH3 was distilled in a flask containing exactly 25.00 of 0.0150 M H3BO3. Titration requires 5.85 mL of standard 0.0150 M NaOH to reach the
Transcribed Image Text:a. Calculate the standard normality of Ca(OH)2. b. Calculate the equivalent weight of the unknown acid. c. From the table below, what is the most probable identity of the unknown acid. Formula weight Probable identity Ascorbic Acid, C6H§O6 Malonic Acid, C3H4O4 Succinic Acid, CH6O4 Citric Acid, C6H;O7 Proticity 1 176.124 104.062 2 2 118.088 192.124 3 n wanted to determine the protein content of his blood. To do so, he obtained 1.00 mL plood, and diluted it to 10.00 mL. From that solution, he subjected 1.00 mL to Kjeldahl ilysis. After digestion, the liberated NH3 was distilled in a flask containing exactly 25.00 of 0.0150 M H3BO3. Titration requires 5.85 mL of standard 0.0150 M NaOH to reach the
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