posted by julie .
Calculate the molarity of the K+ ion in a solution prepared by adding of 5.55 g of K2SO4 to enough water to form 0.500 L of solution.
mols K2SO4 = grams/molar mass
M K2SO4 = mols/L
M K^+ = twice that because there are 2 K ions in 1 molecule of K2SO4.