s of environmenta lull pioddeu u expiore šome of the most important type l prucd

Question

s of environmenta lull pioddeu u expiore šome of the most important type l prucdeu tu explörè šome of the most important types of environ chemical reactions. 1.6 PROBLEMS 1. An aqueous solution is prepared by adding 110 mg of calcium chloride (Cacl) and 50 mg of calcium sulfate (CaSO4) to 500 mL of water. The solution pH is 8.0 ([H+] = 10-8 M, [OH']-10-6 M) (a) Assuming that the salts dissociate completely, express the concentration of each of the dissociation products (Ca+, Cl, and SO2) in mg/L millimolar, and normal (N) units. 30

Explanation / Answer

1)

molarity of CaCl2 = wt.of CaCl2*1000/(m.wt of CaCl2*volume of the solution)

                          = (110*10^-3) *1000)/(110.98*500)

                        = 0.0019M

NORMALITY = MOLARITY * CHARGE

                    = 0.0019*2

                    = 0.0038N

molarity of CaSO4 = wt.of CaSO4*1000/(m.wt of CaSO4*volume of the solution)

                          = (500*10^-3) *1000)/(136.14*500)

                        = 0.0073M

NORMALITY = MOLARITY * CHARGE

                    = 0.0073*2

                    = 0.0146N

THE TOTAL CONCNTRATION OF Ca^+2 = 0.0019+0.0073 = 0.0092 MOLAR

THE TOTAL CONCNTRATION OF Ca^+2 = (0.0038+0.0146) = 0.0184 NORMAL

THE TOAL CONCENTRATION OF Cl^-1 = 2*0.0019 = 0.0038 MOLAR

THE TOTAL CONVETRATION OF Cl^-1 = 2*0.0038 = 0.0076 NORMAL

THE TOTAL CONVETRATION OF SO4^-2 = 0.0073MOLAR

THE TOTAL CONVETRATION OF SO4^-2= 0.0146N

note:

CaCl2-----------------------------> Ca^+2 + 2 Cl^-1

CaSO4 -----------------------------> Ca^+2 + SO4^-2

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