Critical Thinking Questions (Refer to the Graph of Solubilities of Salts.) 1. 80
ID: 706574 • Letter: C
Question
Critical Thinking Questions (Refer to the Graph of Solubilities of Salts.) 1. 80 g of KNO3 are dissolved in 100 mL of H20 at 600C. At what temperature will KNOs begin to crystallize as the solution cools? 2. 100 mL of H2O are saturated with NH4 Cl at 80°C. What mass of NH4Cl will crystallize as the solution cools to 20oC? 3. 500 mL of H20 are saturated with K2S04 at 700C. What mass of K2S04 will crystallize as the solution cools to 10oC? 4. 50 g KCl are dissolved in 200 mL of H20 at 1000C. The solution is cooled to 200C.. What mass of KCI will crystallize? Explain. 5. A solution saturated with NaCl and KCI at100oC is cooled to 200C. Assuming neither salt affects the solubility of the other, calculate the percentage NaCl and percentage KCl in the crystallized product.Explanation / Answer
ANS:
THE ANSWERS TO THESE QUESTIONS ARE GIVEN ESTMATIONS OBSERVED FROM SOLUBILITY CURVES OF RESPECTIVE SALTS IN WATER.
Source of Solubility curves standard -- Taken from internet
1. AT 480C THE SOLUTE, KNO3 BEGIN TO CRYSTALLISE. (80 GRAMS OF SOLUTE IN THE SOLUTION)
2. 40 GRAMS OF AMMONIUM CHLORIDE WILL BE CRYSTALLISED. ( AT 80OC UPTO 65 GRAMS OF AMMONIUM CHLORIDE CAN BE DISSOLVED.)
3. 50 GRAMS OF POTASSIUM SULPHATE CAN BE CRYSTALLISED. (FOR 100 ML OF WATER 10 GRAMS OF POTASSIUM SULPHATE CRYSTALLISES OUT AT 10OC)
4. UPTO 25 GRAMS OF KCl IS SOLUBLE AT EVEN LESSE R TEEMPERATURE . KCl I SHIGHLY SOLUBLE IN WATER. 25 GRAMS OF SAALT IS PRESENT IN PER 100 ML OF WATER IN HT EGIVEN SOLUTION. SO NOAMOUNT OF SALT WILL BE CRYSTALLISED
5.BOTH SALTS HAVE ALMOST SAME SOLUBILTY IN WATER, HOWEVER SODIUM CHLORIDE HAS MORE SOLUBILTY (DUE TO SODIUM ION SIZE LESSER THAN POTASSIUM ION). AS PER THE SOLUBILITY CURVES OF BOTH KCl:NaCl will be in 33:35 percentage ratio.
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