need urgent help chemistry Watch
separately to aqueous magnesium sulfate and to aqueous magnesium nitrate.
ok so i know white precipitate is formed when barium chloride is added to magnesium sulfate as it is insoluble
BUT I DON'T KNOW WHAT HAPPENED WHEN IT IS ADDED IN MAGNESIUM NITRATE
so i guess that it is soluble
i checked mark scheme so it says it is soluble
but how would i know that?
(question from aqa as chem 2)
So it's a displacement reaction where the solvent is aqueous therefore I think you can use this table.
So for example for the second instance, the two products would be
Barium nitrate And magnesium chloride which are both very soluble so I'm guessing the result would also be soluble.
Another way to do it without the solubility table to consider equilibrium.
Compare barium nitrate with the equilibrium of water.
So as H+ + OH- ---> H2O
And Ba + NO3- ---> BaNO3
You can see Barium would react with the OH- which is a strong alkali and H with NO3- forming a strong acid (Nitric acid) which both dissociate fully therefore no precipitate is formed.
You can do the same with all the products to come to a conclusion.
But I think this is probably a memorising thing or maybe it's from a practical you need to know?