A 0.8250 g of soda ash sample was dissolved in distilled H₂O and diluted to 250-mL using a volumetric flask. This solution was labeled as dilute soda ash solution (DSAS). a. A 50.00 mL aliquot portion of the dilute soda ash solution needed 5.20 mL of 0.1200 M HCI to reach the phenolphthalein end point. About 2-3 drops of methyl orange to the same mixture and it needed 10.00 mL of 0.1200 M HCI to reach the methyl orange end point. 1. Calculate the number of millimoles of HCI needed to reach the phenolphthalein end point. 2. Calculate the number of millimoles of HCI needed to reach the methyl orange end point. 3. What is the %Na₂CO, and %NaHCO, present in the soda ash sample? b. From the dilute soda ash solution (DSAS) two 50-mL portions were obtained. The first portion needed 5.20 mL of 0.1200 M HCI to reach the phenolphthalein end point. The second 50-ml portion needed 15.20 mL to reach the methyl orange end point. 4. Calculate the number of millimoles of HCI needed to reach the phenolphthalein end point and relate the value to the number of mmoles of the basic components present. 5. Calculate the number of millimoles of HCI needed to reach the methyl orange end point and relate the value to the number of mmoles of the basic components present. 6. What is the %Na-CO, and %NaHCO, present in the soda ash sample?
A 0.8250 g of soda ash sample was dissolved in distilled H₂O and diluted to 250-mL using a volumetric flask. This solution was labeled as dilute soda ash solution (DSAS). a. A 50.00 mL aliquot portion of the dilute soda ash solution needed 5.20 mL of 0.1200 M HCI to reach the phenolphthalein end point. About 2-3 drops of methyl orange to the same mixture and it needed 10.00 mL of 0.1200 M HCI to reach the methyl orange end point. 1. Calculate the number of millimoles of HCI needed to reach the phenolphthalein end point. 2. Calculate the number of millimoles of HCI needed to reach the methyl orange end point. 3. What is the %Na₂CO, and %NaHCO, present in the soda ash sample? b. From the dilute soda ash solution (DSAS) two 50-mL portions were obtained. The first portion needed 5.20 mL of 0.1200 M HCI to reach the phenolphthalein end point. The second 50-ml portion needed 15.20 mL to reach the methyl orange end point. 4. Calculate the number of millimoles of HCI needed to reach the phenolphthalein end point and relate the value to the number of mmoles of the basic components present. 5. Calculate the number of millimoles of HCI needed to reach the methyl orange end point and relate the value to the number of mmoles of the basic components present. 6. What is the %Na-CO, and %NaHCO, present in the soda ash sample?
Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section: Chapter Questions
Problem 29QRT
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Transcribed Image Text:A 0.8250 g of soda ash sample was dissolved in distilled H₂O and diluted to 250-mL using a
volumetric flask. This solution was labeled as dilute soda ash solution (DSAS).
a. A 50.00 mL aliquot portion of the dilute soda ash solution needed 5.20 mL of 0.1200 M
HCI to reach the phenolphthalein end point. About 2-3 drops of methyl orange to the
same mixture and it needed 10.00 mL of 0.1200 M HCI to reach the methyl orange end
point.
1. Calculate the number of millimoles of HCI needed to reach the phenolphthalein end point.
2. Calculate the number of millimoles of HCI needed to reach the methyl orange end point.
3. What is the %Na₂CO, and %NaHCO, present in the soda ash sample?
b. From the dilute soda ash solution (DSAS) two 50-mL portions were obtained. The first
portion needed 5.20 mL of 0.1200 M HCI to reach the phenolphthalein end point. The
second 50-ml portion needed 15.20 mL to reach the methyl orange end point.
4. Calculate the number of millimoles of HCI needed to reach the phenolphthalein end point and relate the
value to the number of mmoles of the basic components present.
5. Calculate the number of millimoles of HCI needed to reach the methyl orange end point and relate the
value to the number of mmoles of the basic components present.
6. What is the %Na-CO, and %NaHCO, present in the soda ash sample?
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