Question

solubility curve of salts

Solubility Curve of Salts ( Extra Credit: Maximum of 5 pts.) The solubility curve for solutes describes at what the temperature its solution will be saturated (maximum solubility). Beyond that amount, the salt will start to crystallize. The solubility of sodium chloride and potassium chloride in water at different temperatures is given in the table below: Naci КСІ Temp (C) Solubility (g/100g H2O) Temp (C) Solubility (g/100g H,O) 0 35.65 28 10 35.72 35.89 20 30 36.09 30 372 36.37 36.69 42.6 37.04 45.8 37.46 80 37.93 51.3 38.47 53.9 100 38.99 100 56.3 31.2 20 34.2 30.1 50 50 60 70 90 90 1. Plot the solubility of each salt as a function of temperature using Excel and attached both graphs (Solubility vs temperature) on a separate sheet. The enthalpies of solution for these salts are endothermic, adiabatic, or exothermic)? Circle one of these answers. 2. Fit the data using "linear or polynomial" regression (trendline) with lowest possible order that will give a correlation factor "R"of at least 0.99xx. (a) Write the regression equation for NaCl. 510.00027 AT 0:00 BS 135.62 (b) Write the regression equation for KCI 3. Using the regression line for KCl, calculate its solubility at 70°C, in /100 g HO y 0.1191701204 46.115 1160, 1.0 4. A 3.78 gram sample of KCl was dissolved in 10.0 grams of water at 100°C. This solution was then allowed to cool. At what temperature will this solution start to form KCl crystals. 5. If NaCl and KCl were both dissolved together in Ho, at what temperature will the saturated solution have equal concentrations of these salts?

Answer 1

ا y since 81% -22 ة 35629230101306 OTTEST 07475.4 ا و ا Solubility(g/100g H20) ة NaCl ا ة ا Temperature(deg.C) 28.46818 20.17504 0123316 OTO0002 Resid Smof Sounes Parsons A.R-SA 1998 Solubility(g/100g H,0) KCI as per graph, solubility at 70 deg C is 48 23 g 0 20 80 100 40 60 Temperature(DegC) 4. At, temperature 30 degC, solubility of KCl is 3,72 g/10 g of water. So, at 30 degree, it will start to crystallize.

5. At 26-degree, same concentration will be there. -NaCl - KCI Solubility(g/100g H,0) At, 26 deg C both will have same concentration 25+ 100 Temperature(DegC)