How to make a solution of desired conc.?

Feb 2020
3
0
Tempe, Arizona USA
Hi, I want to make 100 ml solution of NaNO3 with conc. 20mg/L. How do I do that?
 
Apr 2015
133
94
What is the problem ?
100mL of water will dissolve 90g of sodium nitrate.
 
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