Assume that 50g of KCl is dissolved in 100g of water at 100*C and the solution is allowed to cool to 30*C. How much KCl crystallizes from the solution?
You need to know the solubility of KCl at 100 C and 30 C. You must have s tables or a graph that will give you that information. Supply that information and we can help.
To determine how much KCl crystallizes from the solution, we need to calculate the solubility of KCl at both 100°C and 30°C and then compare the amount of KCl dissolved at each temperature.
The solubility of KCl changes with temperature, so we need to determine the amount of KCl that can dissolve in both 100g of water at 100°C and 100g of water at 30°C.
First, let's find the solubility of KCl at 100°C. We can use a solubility chart or look up the solubility of KCl in a reliable source. Let's assume that at 100°C, the solubility of KCl is 80g/100g water.
Since we have 100g of water, the maximum amount of KCl that can dissolve at 100°C is:
(80g KCl /100g water) * 100g water = 80g KCl
Next, let's find the solubility of KCl at 30°C. Assuming that at 30°C, the solubility of KCl is 30g/100g water.
Using the same calculation, the maximum amount of KCl that can dissolve at 30°C is:
(30g KCl /100g water) * 100g water = 30g KCl
Now we can compare the amount of KCl dissolved at each temperature.
Since we initially added 50g of KCl to the solution, which is less than the solubility at both temperatures, the entire amount of KCl will dissolve in both cases. Therefore, no KCl will crystallize from the solution when it is cooled from 100°C to 30°C.