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2.84-4g/about 175 = about 1.62E-6
and 1.62E-6/2.25 = 7.2E-7 M
.......K2SO4 ==> 2K^+ + SO4^2-
I......7.2E-7M....0......0
C.....-7.2E-7..2*7.2E-7M..7.2E-7M
E.......you can fill this in.
The easy way to convert to ppm is to calculate the number of mg/L. For example, for 7.2E-7 (sulfate):
g SO4 = 7.2E-7 mol/L x (96 g/mol) = 6.9E-5 g/L and that is 6.9E-2 mg/L = 0.069 ppm.
Check my work.