1 2 Crush up the rock salt Add the rock salt to 50 cm3 of water and stir for 2 minutes 3 4 Heat for 5 minutes and then cool for 5 minutes (TAKE CARE) Filter it
5 Weigh an empty evaporating basin and write the mass down. 6 Pour the liquid into the evaporating basin. Stand it on a piece of paper with your name on the window sill. Clear up and then… Explain why you did each step in the method.