# Chemistry

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How do you prepare 2% Cu S04? How does this solution differ from 2M CuS04?

I am stumped. Thank you.

Deb

• Chemistry -

You don't specify if this is 2% w/w or 2% w/v. I'll assume you mean 2% w/v.
2% w/v CuSO4 means 2g CuSO4 in 100 mL soln which is the same as 20 g CuSO4 in a L.
2M soln means 2 mols CuSO4/L soln and 2 mols CuSO4 = approximately 2*159.6 g CuSO4 or about 319 g CuSO4/L for a 2M soln.

• Chemistry -

Dr. Bob, thanks for answering. What does w/w and w/v and soln mean? i am an a student in chemistry but am having difficulty with this piece.

Deb

• Chemistry -

w/w means weight/weight. Also called m/m for mass/mass. Five % m/m or w/w solution means 5.00 g solute/100 g solution.
w/v means weight/volume. Also called mass/volume. Five % solution m/v or w/v means 5.00 g solute/100 mL solution.
soln is my abbreviation for solution.
There also is a v/v. A 5% v/v means 5 mL solute/100 mL solution.

• Chemistry -

Dr. Bob, thank you kindly. Do you know if copper sulfate is considered an mm solution?

Thanks.

Deb

• Chemistry -

No. The solution is whatever you want to make it. If it isn't specified then the author of the problem just didn't add that information to the problem. I have always been told that if it isn't specified to consider it m/m (w/w) but that isn't a rule.

• Chemistry -

Thank you. You have been so helpful. I appreciate it.

Deb

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