# Solubility of K2Cr2O7 Problem

1. Apr 25, 2015

### jdawg

1. The problem statement, all variables and given/known data
5. The solubility of K2Cr2O7 in water is 125 g/L at 20 °C. A solution is prepared at 20 °C that contains 6.0 grams of K2Cr2O7 in 50. mL of water.
This solution is (A) dilute. (B) saturated. (C) supersaturated. (D) unsaturated.

2. Relevant equations

3. The attempt at a solution
Hi! I'm trying to study for my chemistry final and I have no memory of working problems like this. I feel like we might of just briefly talked about this in class. I know the answer is D, but I don't know how to work this problem. Could someone please point me in the right direction?

2. Apr 25, 2015

### Staff: Mentor

What is the solubility in gm/ml?
What is the concentration of your solution in gm/ml?

Chet

3. Apr 25, 2015

### jdawg

What is gm? :(

4. Apr 25, 2015

### Staff: Mentor

Chet means gram.

Generally the question is about having both solubility and concentration of the prepared solution expressed using the same unit (whatever you choose) and comparing both numbers.

5. Apr 25, 2015

### jdawg

Oh ok. So how do you find the solubility and concentration?

6. Apr 25, 2015

### Staff: Mentor

7. Apr 25, 2015

### jdawg

8. Apr 25, 2015

### Staff: Mentor

Hint: if there are 6.0 grams of K2Cr2O7 in 50. mL of water, how many grams would be in 1 L of identical solution?

Alternatively, if 125 grams dissolve in 1 L, how many grams will dissolve in 50 mL?