Question

you weigh out 0.2360 g of sodium carbonate, dissolve it in DI water, add a drop of phenolphthalein indicator solution and then titrate the sample with 32.84 mL of a 0.1017 M HCl solution. Write a balanced chemical equation for the reaction of sodium carbonate and hydrochloric acid, and then answer the following questions: Pro tip: Avoid rounding errors. Carry extra digits through your calculations and round only your final answer. a) What will the color of your sodium carbonate solution be at the beginning of the titration? (i.e., after adding the phenolphthalein indicator but before adding any HCl) Enter the color of the solution (e.g., red, yellow, blue, etc). If the solution is colorless, enter clear b) What will the color of your sample solution be at the end of the titration? Enter the color of the solution (e.g., red, yellow, blue, etc). If the solution is colorless, enter clear c) Calculate the molar mass of sodium carbonate based on the results of the titration: g/mol d) Calculate the molar mass of sodium based on the results of the titration: g/mol e) Is this a valid method for determining the molar mass of the unknown metal cation?

          you weigh out 0.2360 g of sodium carbonate, dissolve it in DI
water, add a drop of phenolphthalein indicator solution and then
titrate the sample with 32.84 mL of a 0.1017 M HCl solution. Write
a balanced chemical equation for the reaction of sodium carbonate
and hydrochloric acid, and then answer the following questions: Pro
tip: Avoid rounding errors. Carry extra digits through your
calculations and round only your final answer.
a) What will the color of your sodium carbonate solution be at
the beginning of the titration? (i.e., after adding the
phenolphthalein indicator but before adding any HCl) Enter the
color of the solution (e.g., red, yellow, blue, etc). If the
solution is colorless, enter clear
b) What will the color of your sample solution be at the end of
the titration? Enter the color of the solution (e.g., red, yellow,
blue, etc). If the solution is colorless, enter clear
c) Calculate the molar mass of sodium carbonate based on the
results of the titration: g/mol
d) Calculate the molar mass of sodium based on the results of
the titration: g/mol
e) Is this a valid method for determining the molar mass of the
unknown metal cation?

Added by Kenneth J.

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