Question

the concentration in %(m/v) of a solution prepared by dissolving 50.0 sucrose in 220 mL of ethanol. hat is the concentration in ppm of a solution that contains 0.234 g of lactic acid dissolved in 350 mL of aqueous solution? h) How many grams of glucose are present in 850 mL of a 4.25%(m/v) glucose solution. 8. The following questions involve calculations of equivalents or miliequivalents. a) How many equivalents of sodium ion and sulfate ion are present in a solution that contains .650 mol of sodium sulfate Na2SO4? Na+ SO42- b) Normal saline has a sodium concentration of 154 mEq/L. How many equivalents of sodium are present in 750 mL of normal saline solution? c) A 500.0 ml bottle of aluminum chloride (AICI3) solution contains 1.20 equivalents of aluminum ion. Calculate the molarity of this solution.

Answer 1

1. mir = massot solute x100 v volume of solution /M/v = 50 x100 22 lolv = 22.721. of Bem- solute in grams xlob volume of solution (me) ppm = 0;224 x10^= 0.00066ko 350 ppm = 668 ppm b) my_massot Glucose $100 volume of solution 4,25 = m Glucose X 100 850 m-4-254850 - 36.1259 me 100

897 Imole Noso has 142.048 /mol 0.650 mol naso has -g 0.650 X142.04 = 92-3269 amw & gram esuvivalent = valency 26 = 46-163 - geal 1000 me has 15uxio equivalents 1some has - equivalents 150x154 x103 = 0.1155 1000 equivalents