4. Aluminum sulfate (A12(S04)3) s an aluminum-based coagulant that is used durin

Question

4. Aluminum sulfate (A12(S04)3) s an aluminum-based coagulant that is used during water and wastewater treatment to enhance removal of solids. You may assume that when aluminum sulfate is added to water the following reaction occurs: A12(SO4)3 - > 2 Al3 + 3 SO4 2 a. How much aluminum sulfate is required (in grams) to prepare a 2-L volume of 3M00 mg/L Al2(S04)3 solution? b. What is the aluminum (A[?) concentration (in mg/L) in the solution? c. What is the sulfate (S042) concentration (in mg/L) in the solution?

Explanation / Answer

a)
mass required = density * volume
                    = 3000 mg/L * 2L
                     = 6000 mg
                      = 6 g

Answer : 6g

b)
concentration of Al3+ = 2*concentration of Al2(SO4)3
                      = 2* 3000 mg/L
                      = 6000 mg/L
Answer: 6000 mg/L

C)
concentration of SO4 2- = 3*concentration of Al2(SO4)3
                      = 3* 3000 mg/L
                      = 9000 mg/L
Answer: 9000 mg/L

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