Show all calculations clearly. Answers with proper number of significant figures
ID: 521410 • Letter: S
Question
Show all calculations clearly. Answers with proper number of significant figures and unites Answer all the questions in completed sentences. What is the percentage by mass of NaCl in a saturated solution of sodium chloride at 50 degree C? Calculate the solubility of potassium bromide at 24 degree C. A saturated solution of barium chloride at 30 degree C contains 150.0 g water. How much additional barium chloride can be dissolved by heating this solution to 60 degree C? A solution of KCl is saturated at 50 degree C. (a) How many grams of solute are dissolved in 100.0 g of water? (c) What is the mass percent of this solution at 50 degree C? (d) If the solution is h to 100 degree C, how much more KCl can be dissolved in the solution without adding more water? (e) If the solution is saturated at 100 degree C, and then cooled to 30 degree C, how many grams of solute will precipitate out?Explanation / Answer
1. Solubility of NaCl in water 37 g in 100 g water
so,
% by mass NaCl = 37 x 100/137 = 27.01% at 50 oC
2. KBr solubility = 68 g/100 g water at 24 oC
3. BaCl2 saturated solution at 30 oC has 15 g water and 5.7 g BaCl2
when heated to 60 oC, solubility rises to 67 g/100 g water
we can add additional = (10.05 - 5.7) = 4.35 g BaCl2
4. At 50 oC KCl is dissolved to make saturated solution
(a) grams of KCl in solution = 42.5 g
(b) total mass = 142.5 g
(c) mass% KCl = 42.5 x 100/142.5 = 29.82%
(d) when heat to 100 oC,
addition KCl can be added = (57 - 42.5) = 14.5 g
(e) If solution is saturated at 100 oC and then cooled to 30 oC
grams of solute precipitated = 57 - 36 = 21 g
Calculations are based on literature solubility chart values