a Pour the sand-salt mixture into the beaker so that it just covers the base.
b Add about 50 cm3 of water, or add water until the beaker is about one-fifth full.
c Stir the mixture gently for a few minutes.
d Filter the mixture into a conical flask.
e Pour the filtrate into an evaporating basin.
f Heat the salt solution gently until it starts to decrepitate (“spit”). CARE: Keep eye protection on and do not get too close.
g Turn off the Bunsen burner and let the damp salt dry in the dish.