Ice_Phoenix87 Posted November 4, 2004 Share Posted November 4, 2004 i tried a solution of KSO4 and NANO3, and also KCL and NANO3. I cant seem to get the KNO3 crystals. plz help :P thanx guys Link to comment Share on other sites More sharing options...
YT2095 Posted November 4, 2004 Share Posted November 4, 2004 have you tried a sturated soln at heat then allow it to cool slowly (over night is best). long needle like structures will form, that`s your KNO3 Link to comment Share on other sites More sharing options...
Ice_Phoenix87 Posted November 5, 2004 Author Share Posted November 5, 2004 i have been getting NaNO3 and the potassium compound and mixing them seperately before mixing them together. is this a bad thing Link to comment Share on other sites More sharing options...
YT2095 Posted November 5, 2004 Share Posted November 5, 2004 not really, as long as the resultant soln is saturated and hot. Link to comment Share on other sites More sharing options...
Ice_Phoenix87 Posted November 5, 2004 Author Share Posted November 5, 2004 hmmmm well thats what i did i added the compounds to boiling water and then mixed Link to comment Share on other sites More sharing options...
YT2095 Posted November 5, 2004 Share Posted November 5, 2004 personaly I mix the dry chems 1`st and add just enough boiling water to dissolve the 2. add a few existing KNO3 crystals as seeds, and then let it cool as slowly as pos. but if both solns where saturated, it should still work. Link to comment Share on other sites More sharing options...
Ice_Phoenix87 Posted November 5, 2004 Author Share Posted November 5, 2004 oh ok, do i need the seeds? and how long will it take to start seeing crystals? is there anything else i can use as seeds other than K crystals? Link to comment Share on other sites More sharing options...
YT2095 Posted November 5, 2004 Share Posted November 5, 2004 you don`t NEED them, it`s just faster if you use them. without it can take 8 hours or more, depending on your cooling speed. Link to comment Share on other sites More sharing options...
Ice_Phoenix87 Posted November 5, 2004 Author Share Posted November 5, 2004 ok i shall try agian :P and post the results here. does the accuracy of the weight matter much? Link to comment Share on other sites More sharing options...
YT2095 Posted November 5, 2004 Share Posted November 5, 2004 well a rough stoichometric mixture is better (less waste, faster results and higher yeild). so yes it does matter, but not to the miligram Link to comment Share on other sites More sharing options...
raivo Posted November 7, 2004 Share Posted November 7, 2004 You must take quite a lot of substances ( like 100g of KCl for 400ml water and then add there right qunatity of NaNO3 ). These will easyli dissolve if water is hot enough. K2SO4 can't be used because solubility of other product - Na2SO4 is even worse than that of KNO3. Seed may be needed for crystallisation to begin (but this usually is not the case). You can make seed by taking some trops of solution to piece of foil and leting it dry - with hair drier if needed, but do not put it into the solution before temperature is less than 10 C. Link to comment Share on other sites More sharing options...
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