[Sambo123]

I have 0.1% chemical powder, I want to add this chemical powder in water to make 0.01% w/w solution, how much powder should be used to make 1kg w/w solution ?

[AWK]

http://www.chemicalforums.com/index.php?topic=65859.0

[Arkcon]

If it were 100% pure, how much would you need?  if it were now 1% pure, how much would you need?

Try to figure out the problem, on your own, along those lines, and see if you can begin to solve it.

Sorry to answer a question with a question, but that's what we do here.  That's detailed in  the  Forum Rules{click}.  You agreed to follow these rules when you signed up.

[Sambo123]

Sorry I was not able to put it right way,
So here is what I did:

 0.1% powder- 50 grams
  water           - 950 grams   
 So the answer will be 0.05% w/w
So pls tell me if I am wrong.
And also tell me that should I edit the post because I am new bee .
Thanks     

[AWK]

In your starting post the final concentration was 0.01 %



Your calculations are true, but for other amount of solution.