Chemistry You have some arsenic-contaminatedsoil from a local land application areabut the levels aren't quite high enoughfor your experiment, so you want toadd some arsenic to attain a finalconcentration of 70 mg kg- (i.e. ppm).A solution derived from digesting 0.5 g(oven-dry basis) of the original soil inconcentrated nitric and hydrochloricacid and bringing it up to 25.0 mL finalvolume was analyzed for As and foundto have .96 mg L-. How many gramsof reagent grade sodium arsenate(Na2HAsO4 7H2O; MW = 312.01)would you add to17.5 kg of air-dry soil(2% gravimetric water content) toreach your final desired concentrationon a dry weight basis?

to have .96 mg L. How many grams of reagent grade sodium arsenate (Na2HAsO4 7H2O; MW = 312.01) would you add to17.5 kg of air-dry soil (2% gravimetric water content) to reach your final desired concentration on a dry weight basis? %3D

to have .96 mg L. How many grams of reagent grade sodium arsenate (Na2HAsO4 7H2O; MW = 312.01) would you add to17.5 kg of air-dry soil (2% gravimetric water content) to reach your final desired concentration on a dry weight basis? %3D

EBK A SMALL SCALE APPROACH TO ORGANIC L

4th Edition

ISBN:9781305446021

Author:Lampman

Publisher:Lampman

Chapter2: Crystallization

Section: Chapter Questions

Problem 3Q

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Question

Chemistry

You have some arsenic-contaminated
soil from a local land application area
but the levels aren't quite high enough
for your experiment, so you want to
add some arsenic to attain a final
concentration of 70 mg kg- (i.e. ppm).
A solution derived from digesting 0.5 g
(oven-dry basis) of the original soil in
concentrated nitric and hydrochloric
acid and bringing it up to 25.0 mL final
volume was analyzed for As and found
to have .96 mg L-. How many grams
of reagent grade sodium arsenate
(Na2HAsO4 7H2O; MW = 312.01)
would you add to17.5 kg of air-dry soil
(2% gravimetric water content) to
reach your final desired concentration
on a dry weight basis?

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