Data for the next three questions came from this website: http://www.water.sieme
ID: 830376 • Letter: D
Question
Data for the next three questions came from this website: http://www.water.siemens.com/en/applications/drinking_water_treatment/Pages/gf_cs_Phoenix.aspx?stc=wwiis250031
Use this chemical reaction to answer questions A-C:
As2O3 (aq) + 2 Fe(OH)3 (s) --> 2 As(OH)3 (s) + 2 Fe2O3 (s)
The former limit for arsenic in drinking water was 50 ppb. This must now be reduced to less than 10 ppb. If we assume the 1.5 million gallons (5.7 x 106 L) of water treated by Phoenix's water treatment facility every day starts with arsenic at 50 ppb, this represents As2O3 at a concentration of 3.34 x 10-7 M.
A. How many moles of As2O3 must be removed on a daily basis?
B. How many moles of Fe(OH)3 are required to react with the As2O3?
C. How many grams of Fe(OH)3 is this?
Explanation / Answer
A)1.9038 mol
B)3.8076
C) 1003.8 grams
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