Determine whether each of the following solutions will be saturated or unsaturat

Question

Determine whether each of the following solutions will be saturated or unsaturated at 50 degrees C:

a. adding 25 g of KCl to 50 g of H2O

b. adding 150 g of NaNO3 to 75 g of H2O

c. adding 80 g of sugar to 25 g of H2O.

Table:

Substance                                                solubility (g/100g H2O

                                                                        20 degrees C               50 degrees C         

KCl                                                                        34                                       43

NaNO3                                                                   88                                      110

C12H22O11 (sugar)                                            204                                       260     

Explanation / Answer

Hi,

This is pretty logical if you look at it.

a) from the table;
100ml of water will dissolve 43g of KCl at 50 C (water weights approx 1g per ml).
As the question refers to 50ml of water you must first convert this to 100ml. Therefore double the amount and also double the amount of KCl to match. From doing this you get 50g KCl in 100g water.- Refer back to the table and you can see that only 43g s will dissolve. So this will be saturated solution.

b) Again it is easiest to convert all weights as you were using 100g of water.
So...
75/3 x 4 = 100.
Apply the same to NaNO3
150/3 x 4 = 200.

From table you can see that only 110 dissolves in 100g of water. So this again is saturated.

c) Likewise.
25 x 4 = 100g water.

80 x 4 = 320g .
Only 260g will dissolve in water so once again this is saturated solution.

Hope i helped :

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