posted by Denise .
Calculate the solid needed to make a 250ml solution that is 0.34M in sodium cation, using sodium sulfate decahydrate. I came up with 13.685g. but how do I make that into 250ml of a solution that is0.34M in sodium cation?
There are two sodiums per molecule, so divide that mass you got (I didn't check it), by 2 to get the concentration of the Sodium cation