Experiment 11 Titrimetric Analysis of a Commercial Soda Ash Unknown for Sodium Carbonate

Experiment 11 Titrimetric Analysis of a Commercial Soda Ash Unknown for Sodium Carbonate 

Obtain a soda ash sample from your instructor and dry, as before, for 2 h. Allow to cool and store in your desiccator. 

Prepare the flasks and weigh, by difference, as before, three samples of the soda ash, each weighing between 0.4 and 0.5 g. Dissolve in 75 mL of water. 

Calculate the percentage of Na2C03 in the sample, and record at least a sample calculation in your notebook, along with all results and the average. Calculate the ppt relative standard deviation. If your three results do not agree to within 10.0 ppt relative standard deviation, repeat until you have three that do or until you have a precision satisfactory to you instructor. 

---