I read in my text book that the solubility of common elements should be memorised, but it doesn't give a list of which ones we actually need to know for the VCE exam since it's suppose to be 'prior knowledge'. I don't recall our teacher telling us this at all, so which one's do we actually need to learn off by heart?
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Something that is useful to know is that the presence of NO3- in an ionic compound pretty much always makes it soluble! I wouldn't worry about much further than that. You'll notice most ions with metallic ions of a 2+ charge (or greater) tend to be insoluble too. (The reason, outside of the scope of the course, is that this allows the ionic bond to be greater, which makes it harder for it to disassociate in water) |
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I think it's probably good to know the solubility of some elements. A gravimetric analysis question could come up, requiring you to write out an equation and knowing which to mark as the solid. Though it is unlikely you will need to recall data from the solubility table, these could come in handy, and it never hurts to know them! |
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I believe you don't need to know it. History
ReasoningIn the new course (2008+) you are given a very extensive Data Booklet, which has tables of nearly everything! Why would they give you all that information, but omit the solubility table, and have you remember it? My hope is that VCE Chemistry is taking a turn towards learning concepts and not rote-learning databases of knowledge that chemists would normally have access to in a laboratory situation anyway! |
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