Salts F4

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[Kevin Chang]

 Why can't i use the double precipitation method to prepare soluble salts?

E.g  to prepare magnesium chloride .  can i use magnesium sulphate and barium sulphate? crystalise the filtrate ?

[Jong Kah Yin]

There is no reaction between the chemicals suggested.
Double decomposition method is meant for insoluble salt, whereby one has to use 2 solutions containing the cations and anions present in the insoluble salt.
For magnesium chloride / any soluble salts. you have to use an acid ( that contain the anion of the soluble salt) and metal/ metal oxide/ metal carbonate; in this case hydrochloric acid with magnesium/ magnesium oxide/ magnesium hydroxide / magnesium carbonate.

[Kevin Chang]

Sorry should be barium sulphate jong. Typing error.

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