Réponse :
Explications :
1) Pour 50 cm3 dilute hydrochloric acid into a test tube.
2) Add a small amount of magnesium ribbon to the
acid.
Fizzing is seen and the magnesium disappears.
3) Continue adding acid and stir with a spatula until
some magnesium remains.
4) There is now a residue of
magnesium.
5) Pour off the magnesium chloride solution
into an evaporating basin.
6) Heat the evaporating basin
until all the water has evaporated. 7)
Leave until crystals
form.
7) Then pat the crystals dry with writing paper.
