How would you prepare a 500 ml lab stock of:

[jKotha]

Homework Statement

How would you prepare a 500 ml lab stock of 20% (w/v) SDS

That is all that is stated in the problem.

Homework Equations

I'm assuming for w/v the volume would be 0.5L but the weight I'm not sure.

The Attempt at a Solution

0.5L x .20 = .1g SDS / .5 L .. is that correct? doesn't make sense to me.

Please help!

 

[chemisttree]

What does 20% SDS (w/v) mean? Once you know that, the answer will present itself...