If 20 g KCL is dissolved in 100g of water at 20 degrees C, is the solution unsaturated, saturated, or supersaturated?
If you google "potassium chloride Wiki", you will find somewhere the solubility of KCl as 34.4 g/100 ml. of water at 20 degrees C.
Refering to your previous question on saturated solution, you will find a definition of solubility, you should be able to tell if 20 g of KCl in 100 g of water is unsaturated or saturated.
Recall that the definition of
"saturated solution"
is
"A solution in which the maximum amount of solvent has been dissolved."
Note: water weighs (almost exactly) 1 g per ml.
so it is unsaturated
I think you are not reading the graph, and are guessing. You are wrong.
http://www.saskschools.ca/curr_content/chem30_05/graphics/4_graphics/sol_curve.jpg
i think it is saturated
unsaturated
Excellent, Kate!
To determine whether the solution is unsaturated, saturated, or supersaturated, we need to compare the amount of solute dissolved (in this case, KCl) to the maximum amount that can be dissolved at a given temperature.
To find this information, we can refer to the solubility table or solubility curve for KCl. The solubility of KCl at 20 degrees Celsius indicates the maximum amount that can be dissolved in 100 grams of water.
Assuming that the solubility of KCl at 20 degrees Celsius is greater than 20g (the amount of KCl dissolved), we can conclude that the solution is unsaturated. This means that the solution still has the capacity to dissolve more KCl.
If the solubility of KCl at 20 degrees Celsius is equal to 20g, the solution is saturated. This means that the solution has reached its maximum capacity to dissolve KCl.
If the solubility of KCl at 20 degrees Celsius is less than 20g, the solution is supersaturated. This means that more KCl has been dissolved than what is normally possible at that temperature, creating a condition that is thermodynamically unstable.
So, to determine whether the solution is unsaturated, saturated, or supersaturated, we need to find the solubility of KCl at 20 degrees Celsius.
Kate,
You'd have to read the graph, but concentrate on the line that says KCl. The x-axis represents the temperature, and the y-axis represents the maximum number of grams of solute (KCl) that dissolves in water. This value represents the saturation point. Any solution containing less than this quantity is unsaturated.
Now, can you give it another try?