b) Excessive phosphate levels in water systems may contribute to several environmentalproblems such as eutrophication. Gravimetric analysis could be performed to determinephosphorus, P (30.9738 g/mol) level in aqueous sample by converting it to P:O7. A 25 gof unknown water sample was acidified, treated with precipitating agent and then heated toP:07 (173.94 g/mol). At the end of experiment, sample recorded 6.09 % P. Determine theamount of P2O7 (in grams) required to be precipitated to obtain this result a) Tiffany received a pesticide sample and was asked to analyse its arsenic content. Samplewas precipitated as MGNH4ASO4 (181.25 g/mol) and subsequently heated to formMg.As207 (310.45 g/mol). Results shown that a 1.134 g pesticide sample yielded 135.8mg of Mg:As207. Based on the information provided above, report the gravimetric factorand % w/w As (74.92 g/mol) in the pesticide sample.

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b) Excessive phosphate levels in water systéms may contribute to several environmental problems such as eutrophication. Gravimetric analysis could be performed to determine phosphorus, P (30.9738 g/mol) level in aqueous sample by converting it to P.Or. A 25 g of unknown water sample was acidified, treated with precipitating agent and then heated to P:O; (173.94 g/mol). At the end of experiment, sample recorded 6.09 % P. Determine the amount of P207 (in grams) required to be precipitated to obtain this result

b) Excessive phosphate levels in water systéms may contribute to several environmental problems such as eutrophication. Gravimetric analysis could be performed to determine phosphorus, P (30.9738 g/mol) level in aqueous sample by converting it to P.Or. A 25 g of unknown water sample was acidified, treated with precipitating agent and then heated to P:O; (173.94 g/mol). At the end of experiment, sample recorded 6.09 % P. Determine the amount of P207 (in grams) required to be precipitated to obtain this result

Introductory Chemistry: A Foundation

9th Edition

ISBN:9781337399425

Author:Steven S. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Donald J. DeCoste

Chapter15: Solutions

Section: Chapter Questions

Problem 3CR

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Lead poisoning has been a hazard for centuries. Some scholars believe that the decline of the Roman Empire can be traced, in part, to high levels of lead in water from containers and pipes, and from wine that was stored in leadglazed containers. If we presume that the typical Roman water supply was saturated with lead carbonate, PbCO3 (Ksp = 7.4 1014), how much lead will a Roman ingest in a year if he or she drinks 1 L/day from the container?
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