Excess hydrochloric acid is added to dissolve and react with the soda ash. The excess acid is then titrated with sodium hydroxide solution. How do you determine the mass percentage of sodium carbonate in soda ash?

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Nelly StrackeLv2

28 Sep 2019

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Please help with the last two parts!!

1.A 1.478 g sample of soda ash required 17.41 mL of 0.6714 MHCl to reach the second endpoint. Determine the % Na₂CO₃in the soda ash sample.

0.6714 M X 0.01741 L = 0.01169 mol HCl

0.01169 mol HCl X X = 0.6195 g Na₂CO₃

( 0.6195 g Na₂CO₃/ 1.478 g Na₂CO₃) X 100 = 41.91% Na₂CO₃

2.A particular soda ash sample contains 20.33% Na₂CO₃. How many mL of 0.4009 MHCl would be required to neutralize a 1.559 g of this soda ash sample?

3.Letâs suppose you didnât follow the procedure and failed to quantitatively transfer the soda ash sample to the Erlenmeyer flask. How would this specifically affect your calculated percentage of Na₂CO₃?

A 0.1997g sample of primary standard sodium carbonate was weighed out into a 250-ml beaker and diluted with 50ml of distilled water. An HCl solution of unknown concentration was used to titrate the Na2CO3 in the beaker. After passing the first equivilance point at about 22ml where the phenolphthalein indicitator becasue colorloss, a few drops of bromcresol green indicator were added. When the indication began to change from blue to a green color, the titration was stopped and the solution was boiled and the indicator returned to a blue color as carbon dixoide was expelled from the solution. After cooling the sample back to room temperature, the titration was continued untill a total of 45.12 mL of HCl had been added and a distince color change from blue to green was observed.

Calculate the concentration of the HCl titrant solution using the volume to reach the second equivilance point.

A 0.3520g sample of an unknown concentration of soda ash sample was weighed out and titrated by the same procedure using the same HCl titrant solution, and a distinct color change at the sencond equivilance point was observed at 20.09 mL. Using the previously determined HCl solution concentration and the soda ash sample mass, determine the weight percent of sodium carbonate in the soda ash unknown.