2) To the solution in problem 1 (d) at 100 degrees celsius, 10g of water are added, and the solution is cooled to 0 degrees celsius... (problem 1d: the number of grams of water required to dissolve a mixture containing 15 g KNO3 and 3.5 g CuSO4 * 5 H20, assuming that the solubility of one substance in not affected by the presence of another).
How much KNO3 remains in solution?
How much KNO3 crystallizes out?
How much CuSO4 * 5 H20 crystallizes out?
What percent of the KNO3 in the sample is covered?
You need the solubility of KNO3 and CuSO4.5H2O at zero C and 100 C. There was an experiment like that in an old lab manual of mine BUT the instructions gave the solubility in a table.
The solubity of KNO3 at 0 is 20 g and CuSO4.5H2O at 0 is 10 g. i'm lost as to how this pertains to the answers.
That's half of it. What is the solubility at 100 C?
Ah, the wonderful world of solubility and crystallization! Let's solve this puzzle one question at a time, shall we?
1) How much KNO3 remains in solution? Well, since we're assuming that the solubility of one substance is not affected by the presence of another, we can simply subtract the amount that crystallizes out from the initial amount. So, how much is that? Let's find out!
2) How much KNO3 crystallizes out? To answer this, we need to determine the solubility of KNO3 at 0 degrees Celsius. Once we have that information, we can calculate how much of it will come out of solution. But hey, don't worry, I'm not going to put you through all that math! Instead, let's imagine a tiny KNO3 crystal getting cold feet and deciding to leave the solution party. Bye-bye, little crystal!
3) How much CuSO4 * 5 H20 crystallizes out? Now, this crystallization party wouldn't be complete without some CuSO4 * 5H20 joining in, right? To figure out how much will crystallize out, we'll once again consider the solubility at 0 degrees Celsius. And remember, it's not just CuSO4, but it's got its five H20 friends tagging along!
4) What percent of the KNO3 in the sample is covered? Ah, this question feels like a little math challenge! To calculate the percentage, we'll compare the amount of KNO3 that remains in solution to the initial amount. Then, we'll perform some fancy mathematical maneuvers to express that as a percentage. Ta-da!
So, dear questioner, get ready to put on your thinking cap and let's dive into the world of solubility and crystallization!
To find the answers to these questions, we need to consider the solubility of KNO3 and CuSO4 * 5H2O at different temperatures, as well as the amount of water that remains in the solution after cooling.
1) To determine how much KNO3 remains in solution, we need to find the solubility of KNO3 at 0 degrees Celsius. You can look up the solubility of KNO3 at different temperatures from a reliable source such as a chemistry handbook or an online database. Let's assume the solubility of KNO3 at 0 degrees Celsius is 100 grams per 100 grams of water.
We know that initially there were 15 grams of KNO3 in the solution, and 10 grams of water were added. So the total amount of water in the solution is 10 grams (initial) + 10 grams (added) = 20 grams.
The maximum amount of KNO3 that can dissolve in 20 grams of water at 0 degrees Celsius is 20 grams * (100/100) = 20 grams.
Therefore, all the KNO3 remains in solution since the initial amount of KNO3 (15 grams) is less than the maximum solubility of KNO3 (20 grams). So none of the KNO3 crystallizes out.
2) Since none of the KNO3 crystallizes out, the amount of KNO3 that crystallizes out is 0 grams.
3) To determine the amount of CuSO4 * 5H2O that crystallizes out, we need to consider the solubility of CuSO4 * 5H2O at 0 degrees Celsius. Let's assume the solubility of CuSO4 * 5H2O at 0 degrees Celsius is 50 grams per 100 grams of water.
The maximum amount of CuSO4 * 5H2O that can dissolve in 20 grams of water at 0 degrees Celsius is 20 grams * (50/100) = 10 grams.
We initially had 3.5 grams of CuSO4 * 5H2O in the solution, which is less than the maximum solubility of CuSO4 * 5H2O. Therefore, none of the CuSO4 * 5H2O crystallizes out.
4) To calculate the percent of KNO3 in the sample that is covered, we can compare the amount of KNO3 that remains in solution (which we found to be 15 grams) to the initial amount of KNO3 in the sample (which is also 15 grams).
The percent of KNO3 covered can be calculated using the formula:
Percent of KNO3 covered = (Amount of KNO3 remaining / Initial amount of KNO3) * 100
= (15 grams / 15 grams) * 100
= 100%
Therefore, 100% of the KNO3 in the sample is covered.