How is the trend in the solubilities of fluorides and hydroxides different from that of sulphate of the alkaline earth metals?
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Here we shall look at the solubilities of the hydroxides and sulphates of Group 2 metals.
Solubility is the maximum amount a substance will dissolve in a given solvent. It is measured in either, grams or moles per 100g of water.
The trends of solubility for hydroxides and sulphates are as follows:
Magnesium hydroxide (Mg(OH)2) is said to be sparingly soluble because it does not dissolve in very well and Be(OH)2 and BaSO4 are insoluble.
The chemical test for a sulphate is to add Barium Chloride. If positive, the solution will go milky. This means the precipitate barium sulphate has been formed; which, as you can see from the solubility table above, this is insoluble.
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