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To determine the amount of sulfur present in a fertilizer in the form of sulfate (SO42- ) ions and also to find the percentage by mass of sulfur (as sulfate) in the fertilizer.
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Experiment 2: Gravimetric determination of sulfate in fertilizer Aim: To determine the amount of sulfur present in a fertilizer in the form of sulfate (SO4 2- ) ions and also to find the percentage by mass of sulfur (as sulfate) in the fertilizer. Method: Results: Fertilizer brand: Yates Gro-Plus Lawn food. The sulfur as sulfate percentage on the packaging is 16%. Fertilizer used (g) Filter paper (g) Mixture (ml) Watch Glass (g) Before 1.01 0.5 200 44.15 After 1.401 195 44.551 1. The mass of barium sulfate is: The mass of filter paper after the experiment - the filter paper before the experiment. Therefore the mass of barium sulfate is 1.401 - 0.5 = 0.901g 5 a.) If the mixture in step five of the procedure were not tested with more barium chloride solution we wouldn't know if there were excess sulfate ions. If all the sulfate ions did not precipitate then the calculations would be incorrect because it would give us less than the correct answer. b.) If we did not test...
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