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4. Study the solubility curve below carefully and answer the questions accordingly. I. For most substances solubility increases as the temperature increases. Which substances are the exceptions on the graph? (2marks) II. What mass of a solute will dissolve in 100mL of water at the following temperature? ( 1 mark each) a. KNO3 at 70°C b. NaCl at 100°C C. NH4Cl at 90°C d. Which of the above three substances is more soluble in water at 15°C? (2 marks) Grams of solute per 100 g H₂O EONX 150 140 130 120 110 100 90 80 70 60 50 40 X NaCl 30 20 10 Ce2(SO4)3 0 0 10 20 30 40 50 60 70 80 90 NHAC​



Answer :

Answer:

For most substances soolubility increases as temperature increases, but there are exceptions on the graph. These exceptions include:NaCl: Its solubility remains relatively constant as temperature increases.Ce2(SO4)3: Its solubility decreases as temperature increases.II. Mass of solute dissolved in 100mL of water at different temperatures:a. KNO3 at 70°C: Approximately 130 grams of KNO3 will dissolve.

b. NaCl at 100°C: Approximately 36 grams of NaCl will dissolve.

c. NH4Cl at 90°C: Approximately 100 grams of NH4Cl will dissolve.III. Comparing solubility at 15°C:At 15°C, NaCl is more soluble than both KNO3 and NH4Cl.

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