A sodium hydroxide solution is made by dissolving 3.5 g of sodium hydroxide with 500 cm^3 of water. What is the concentration of the solution in g dm^-1?
3.5 g of sodium500 cm3 of water is 0.5 dm33.5 / 0.5 = 7 g dm-3
3.5 g of sodium500 cm3 of water is 0.5 dm33.5 / 0.5 = 7 g dm-3
