1. A 0.8250 g of soda ash sample was dissolved in distilled H2O and diluted to 250-mL using a volumetric flask. A 50.00 mL aliquot portion of the dilute soda ash solution needed 4.50 mL of 0.1200 M HCl to reach the phenolphthalein end point and 10.00 mL to reach the methyl orange end point.
Consider the titration carried out in the 50-mL aliquot portion of the dilute soda ash solution:
Calculate the number of millimoles of HCl needed to reach the phenolphthalein end point.
2. Calculate the number of millimoles of HCl needed to reach the methyl orange end point.
3. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of Na2CO3 are there in the aliquot portion that was titrated?
4. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of NaHCO3 are there in the aliquot portion that was titrated? 5. What is the %Na2CO3 (%w/w) present in the soda ash sample? FW Na2CO3 = 105.99 g/mol (Hint: Use dilution factor) 6. What is the %NaHCO3 (%w/w) present in the soda ash sample? FW NaHCO3 = 84.01 g/mol (Hint: Use dilution factor) 7. What is the % inert component in the soda ash sample? (Hint: Subtract %Na2CO3 and %NaHCO3 from 100%) 8. Which of the following is an incompatible mixture in soda-ash analysis? NaOH - NaHCO3NaOH - Na2CO3 Na2CO3 - NaHCO3
1. A 0.8250 g of soda ash sample was dissolved in distilled H2O and diluted to 250-mL using a volumetric flask. A 50.00 mL aliquot portion of the dilute soda ash solution needed 4.50 mL of 0.1200 M HCl to reach the phenolphthalein end point and 10.00 mL to reach the methyl orange end point.
Consider the titration carried out in the 50-mL aliquot portion of the dilute soda ash solution:
Calculate the number of millimoles of HCl needed to reach the phenolphthalein end point.
2. Calculate the number of millimoles of HCl needed to reach the methyl orange end point.
3. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of Na2CO3 are there in the aliquot portion that was titrated?
4. From the volumes of HCl needed to reach the phenolphthalein and methyl orange endpoints, how many millimoles of NaHCO3 are there in the aliquot portion that was titrated? 5. What is the %Na2CO3 (%w/w) present in the soda ash sample? FW Na2CO3 = 105.99 g/mol (Hint: Use dilution factor) 6. What is the %NaHCO3 (%w/w) present in the soda ash sample? FW NaHCO3 = 84.01 g/mol (Hint: Use dilution factor) 7. What is the % inert component in the soda ash sample? (Hint: Subtract %Na2CO3 and %NaHCO3 from 100%) 8. Which of the following is an incompatible mixture in soda-ash analysis? NaOH - NaHCO3NaOH - Na2CO3 Na2CO3 - NaHCO3
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