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 table below, what is the most probable identity of the unknown acid. Probable identity Ascorbic Acid, C6H§O6 Malonic Acid, C3H4O4 Succinic Acid, CH,O4 Citric Acid, CsH3O7 Formula weight Proticity 176.124 104.062 2 118.088 192.124 3

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 table below, what is the most probable identity of the unknown acid. Probable identity Ascorbic Acid, C6H§O6 Malonic Acid, C3H4O4 Succinic Acid, CH,O4 Citric Acid, CsH3O7 Formula weight Proticity 176.124 104.062 2 118.088 192.124 3

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

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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Question

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 table below, what is the most probable identity of the unknown acid.
Probable identity
Ascorbic Acid, C6H³O6
Malonic Acid, C3H4O4
Succinic Acid, CH,O4
Citric Acid, C6HgO7
Formula weight
Proticity
1
176.124
104.062
118.088
192.124
3

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