3.) 15.0 mL of 0.309 M Na SO4 and 35.6 mL of 0.200 M KCI are mixed. Determine th

Question

3.) 15.0 mL of 0.309 M Na SO4 and 35.6 mL of 0.200 M KCI are mixed. Determine the following concentrations: [Na']; [So.]; [CI] tha 5) A 40% acid solution is mixed with a-75% acid solution to produce 140 liters of a 50 acid solution? How many liters of each acid solution was mixed? motarit solution. 9. The density of toluene (C,Hs) is 0.867 g/mL, and the density of thiophene (C4H4S) is 1.065 g/mL. A solution is made by dissolving 9.660 g of thiophene in 260.0 mL toluene.solvn a. Calculate the molality of thiophene in the solution. b. Assuming that the volumes of the solute and solvent are additive, determine the molarity of thiophene in the solution.

Explanation / Answer

3)

Na2SO4 concentration in the mixture = millimoles / total volume

                                                          = 15 x 0.309 / 15 + 35.6

                                                           = 0.0916 M

[Na+] = 2 x 0.0916 = 0.183 M

[SO42-] = 0.0916 M

KCl concentration in the solution = millimoles / total volume

                                                   = 35.6 x 0.200 / (15 + 35.6)

                                                   = 0.141 M

[Cl-] = 0.141 M

5) V1 = 40% acid volume

        V2 = 75 % acid volume

total V1 + V2 = 140 -----------------------> (1)

C = C1 V1 + C2 V2 / V1 + V2

50 = 40 V1 + 75 V2 / 140

40 V1 + 75 V2 = 7000 ---------------------> (2)

V1 = 100

V2 = 40

volume of 40 % acid = 100 L

volume of 75 % acid = 40 L

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