Question

LAB PARTNERIS)- REPORT FOR EXPERIMENT 12DATE Properties of Solutions A. Concentration of Saturated Solution 1. Mass of empty evaporating dish 2. Mass of dish + saturated potassium chloride solution 3. Mass of dish + dry potassium chloride, 1st heating 4. Mass of dish + dry potassium chloride, 2nd heating 5. Mass of saturated potassium chloride solution Show Caleulation Setup 6. Mass of potassium chloride in the saturated solution Show Caleulation Setup ( 7. Mass of water in the saturated potassium chloride solution Caleulation Setup--p 8. Mass percent of potasium chloride in the saturated solution Show Caleulation Setup as of kel in satsated Solition 1607 9. Grams of potassium chloride per 100 g of water (experimental) in the original solution. Show Caleulation Setup 10. Grams of potassium chloride per 100 g of water (theoretical) (From Table 12.1) at 20°C -109-

Answer 1

Solution :-

#5) Mass of saturated potassium chloride solution

Mass of solution = (mass of + solution) – mass of dish

                               = 44.04 g – 39.78 g

                                = 4.26 g

#6) mass of potassium chloride in the solution

Mass of potassium chloride = (mass of dish 2^nd heating) – (mass of empty dish)

                                                 = 40.78 g – 39.78 g

                                                  = 1.00 g

#7) mass of water = mass of solution – mass of potassium chloride

                                 = 4.26 g – 1.00 g

                                 = 3.26 g

#8)mass % of potassium chloride in the saturated solution = [mass of KCl / mass of solution]*100%

                                                                                                         =[1.00 g / 4.26 g]*100%

                                                                                                         = 23.5 %

#9) grams of KCl per 100 g of water

1.00 g KCl * 100 g H2O / 3.26 g H2O = 30.67 g KCl

So it is 30.67 g potassium chloride per 100 g water.

#10) in the theoretical table of solubility of salt per 100 g water at 20 C

The KCl theoretical mass per 100g water is about 35.0 g KCl