Use the following chemical reaction to answer the following questions: A s 2 O 3

Question

Use the following chemical reaction to answer the following questions: As2O3(aq)+2 Fe(OH)3(s)--->2(As)(OH)3(s)+2 Fe2O3(s)

The former limit for arsenic in drinking water was 50ppm. This must now be reduced to less than 10ppm. If we assume the 1.5 million gallons of water (5.7 x 10 to the 6 power L) of water treated by the phoenix water treatment facility everyday starts with arsenic at 50 ppm, this represents As2O3 at a concentration of 3.34x10.7M. How many moles of As2o3 must be removed on a daily basis?

How many moles of Fe(OH)3 are required to react with the As2O3?

How many grams is this?

Convert this to lbs & figure out how long the 60,000 lbs of iron based media should last the city?

Explanation / Answer

if 40 ppm corresponds to 3.34*10^-7.

then 20 ppm corresponds to 1.67*10^-7.

moles = concentration*volume

so moles = 1.67*10^-7 * 5.7*10^6

moles = 0.9519 moles are to be removed.

moles of Fe(OH)3 required are twice the moles of arsenic to be removed.

so moles of Fe(OH)3 = 2*0.9591 = 1.9038.

weight = moles * atomic weight = 1.9038*107 = 203.7066 gm.

weight = 203.7 gm = 0.449 lb.

number of days the city would last = 60000/0.449 = 133630.3 days.

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