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datou_jing

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Originally posted by aust_jhe at 2010-10-19 23:33:46:
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A  solution  of  35.9  g  (0.26 mole) of  KV03 in 900-1OOO ml of  hot water was treated with  20 ml  of  1 F nitric acid, 20 ml  of  1.0 F manganese  sulfate, and  10.8  g  (40  mmoles)  of  potassium  peroxydisulfate,  in  that  order.
5Â¥2010-10-21 15:38:07
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aust_jhe

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datou_jing(½ð±Ò+2): 2010-10-21 15:38:20
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datou_jing

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Originally posted by sundaoan at 2010-10-19 17:55:37:
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datou_jing(jiangyun2´ú·¢): ½ð±Ò+3 2013-10-18 08:58:11
Formal (F): The formal (F) is yet another measure of concentration similar to molarity. It is used rarely. It is calculated based on the formula weights of chemicals per litre of solution. The difference between formal and molar concentrations is that the formal concentration indicates moles of the original chemical formula in solution, without regard for the species that actually exist in solution. Molar concentration, on the other hand, is the concentration of species in solution. For example: if one dissolves sodium carbonate (Na2CO3) in a litre of water, the compound dissociates into the Na+ and CO32- ions. Some of the CO32- reacts with the water to form HCO3- and H2CO3. If the pH of the solution is low, there is practically no Na2CO3 left in the solution. So, although we have added 1 mol of Na2CO3 to the solution, it does not contain 1 M of that substance. (Rather, it contains a molarity based on the other constituents of the solution.) However, one can still say that the solution contains 1 F of Na2CO3.
6Â¥2013-10-03 11:48:23
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