Question

In the laboratory you dissolve 21.7 g of potassium sulfide in a volumetric flask and add water to a total volume of 125 mL. What is the molarity of the solution? What is the concentration of the potassium cation? What is the concentration of the sulfide anion? Submit Answer

Answer 1

Pota ssium sullide Ķs Mus molar mass = 110g/mol we know that Molarity (M) = 0 In weight xl Molar mass Volume of solution (in L) from data Volume (V) - 125ml -125 x163L weight = 21.79 :: substitute the values to get molarity of Solution M: 21.79 x X 110 g/mol 125x1631 M : 21.7 x 103 mol llox 125 L - 1.578 Mollet á Molarity of Solution = 1.58 malleit = 1:58M In the solution Ks - akt + 5 2 : Qe a [kt] = Potassium cation concentration = q (1:58M) = 3:16M [K] = 3:16M [5] = sullide anion concentration = 1.58M [5] = 1.5874