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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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Introduction

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. ...read more.

Middle

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 the filtrate with the silver nitrate when the precipitate was washed in step eight, we wouldn't know if any chloride ions filtered through therefore the calculations wouldn't be accurate. 6. Possible sources of error include: - Inaccurate or contaminated equipment. If the equipment was used before then it is possible that it may be contaminated with chemicals from past experiments (for example hydrochloric acid). ...read more.

Conclusion

- Human error. In all experiments there is always the risk of not recording the correct result or not weighing a sample properly. To avoid this, the only thing you could do is to double check the recordings and/or get your partner to check it. Conclusion: The amount of sulfur present in the fertilizer in the form of sulfate ions was 0.371g. The percentage by mass of sulfur (as sulfate) in the fertilizer was 12.25% however the expected amount was 16%. Therefore in our sample we missed out on 3.75% of sulfur. There was 36.73% of sulfate in the fertilizer. Prac report: Experiment 2 Ashan Desai 12A ...read more.

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