What is the solubility of K2Cr2O7 in water at 20 °C?

[jdawg]

Homework Statement

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.

Homework Equations

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?

 

[Chestermiller]

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

Chet

 

[jdawg]

What is gm? :(

 

[Borek]

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.

 

[jdawg]

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

 

[Borek]

how do you find the solubility

Have you read the problem?

The solubility of K2Cr2O7 in water is 125 g/L

 

[jdawg]

I'm panicking about this exam man, my mind is clouded. No need to be sassy.

 

[Borek]

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?