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

Fundamentals Of Analytical Chemistry

9th Edition

ISBN:9781285640686

Author:Skoog

Publisher:Skoog

Chapter7: Statistical Data Treatment And Evaluation

Section: Chapter Questions

Problem 7.22QAP

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The ingredients in herbicides and pesticides must be carefully monitored. Arsenic in a pesticide sample was precipitated as MgNH4AsO4 (molar mass = 181.25 g/mol). This was heated to form the more stable Mg2As2O7 (molar mass = 310.45 g/mol). Based on the following data, what is the numeric value of the gravimetric factor for the sample?
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