Question

1. If ordinary filter paper, instead of ashless paper were used, how would your experiemental results...

1. If ordinary filter paper, instead of ashless paper were used, how would your experiemental results on Sulfate analysis be affected? would they be too high or too low? why are the washes of the barium sulfate tested with AgNO3? Does the solubility of BaSO4 increase significantly as the temperature of the solution is increased?

thanks for helping!!!!

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Answer #1

1. Ashless filter paper is pure cellulose and will decompose in the presence of heat and air to water and carbon dioxide. No residual non-volatile substances remain. where as in case of ordinary filter paper ashes remain and the results will be high because of the ashes.

2. AgNO3 is added to precipitate NaCl present in the BaSO4 it should dissolve and cause a precipitate of AgCl in the wash water.

3. Barium sulfate is filtered from a hot solution since the speed of filtration is greater at the higher temperature (the solubility loss is insignificant).

Reference

http://www.csudh.edu/oliver/che230/labmanual/gravsulf.htm

You are welcome.

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