Do you mean 0.1m or 0.1M?
Do you want that total ions or that many Na and that many sulfate.
if you want a solution that is .1m in ions what mass of na2so4 must you dissolve in125 grams of water assume total dissolution of ionic solid.
2 answers
0.1 molality or m
total ions of Na2SO4
total ions of Na2SO4