most recent 30 from http://merspi.com.au 2010-07-30T10:46:24Z http://merspi.com.au/feeds/question/1056 http://www.creativecommons.org/licenses/by-nc/2.5/rdf http://merspi.com.au/questions/1056/whats-the-solubility-table-we-need-to-learn Dan 2010-01-22T06:57:25Z 2010-02-13T23:58:52Z

<p>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?</p>

http://merspi.com.au/questions/1056/whats-the-solubility-table-we-need-to-learn/1058#1058 Collin Li 2010-01-22T08:16:22Z 2010-01-22T08:16:22Z

<p>I believe you <strong>don't</strong> need to know it.</p> <h3>History</h3> <ul> <li>In 2007 and before, you were required to have some familiarity with the solubility table.</li> <li>In 2008 and beyond, I have not seen questions in the past exams that require this knowledge.</li> </ul> <h3>Reasoning</h3> <p>In 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?</p> <p>My hope is that VCE Chemistry is taking a turn towards learning <em>concepts</em> and not rote-learning databases of knowledge that chemists would normally have access to in a laboratory situation anyway!</p>

http://merspi.com.au/questions/1056/whats-the-solubility-table-we-need-to-learn/1143#1143 Edmund 2010-02-05T09:57:45Z 2010-02-05T09:57:45Z

<p>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 <em>could</em> come in handy, and it never hurts to know them!</p>

http://merspi.com.au/questions/1056/whats-the-solubility-table-we-need-to-learn/1202#1202 Collin Li 2010-02-13T23:58:52Z 2010-02-13T23:58:52Z

<p>Something that is useful to know is that the presence of NO₃^- in an ionic compound pretty much <em>always</em> makes it soluble!</p> <p>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)</p>