Some of it comes from the ocean. It turns out that sea salt brine is a great source of magnesium chloride. To extract the magnesium, water is evaporated to form magnesium chloride anhydrous ...
So, if I'm going to test you now. So, if a copper is added to a solution of magnesium chloride no reaction occurs. What does that tell you about the reactivity between copper compared to magnesium?