std 9. science. English Medium. Pranjal tested the solubility of three different substances at different temperatures and collected the data as given below (results are given in the table, as grams of substance dissolved in 100 gms of water to form a saturated solution.)
Answers
Answer:
(a) At 313 K 62 g of potassium nitrate dissolved in 100 g of water. So to produce a saturated solution of potassium nitrate in 50 g of water we need
100
62
×50=31 g of potassium nitrate.
(b)Some soluble potassium chloride will separate out in the form of crystal at room temperature because the solubility of potassium chloride will decrease.
(c)
(i) Solubility of Potassium nitrate at 293 K is 32 g.
(ii) Solubility of sodium chloride at 293 K is 36 g.
(iii) Solubility of Potassium chloride at 293 K is 35 g.
(iv) Solubility of Ammonium chloride at 293 K is 37 g.
The solubility of Ammonium chloride is highest at this temperature.
(d)The solubility of salt increases with the increase in temperature.
Explanation:
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Below is the solution:
Explanation:
(a) 62 g potassium nitrate dissolved in 100 g water at 313 K. So, to make a saturated potassium nitrate solution in 50 g of water, we'll require
100
62
Potassium nitrate (50=31 g)
(b)As the solubility of potassium chloride decreases, some soluble potassium chloride will crystallise and separate at room temperature.
(c)
I At 293 K, potassium nitrate has a solubility of 32 g.
(ii) At 293 K, sodium chloride has a solubility of 36 g.
(iii) Potassium chloride has a solubility of 35 g at 293 K.
(iv) Ammonium chloride has a solubility of 37 g at 293 K.
At this temperature, ammonium chloride has the greatest solubility.
(d)As the concentration of salt rises, so does its solubility.