Asked by Alissa
Im preparing my report for Synthesis of Alum chemistry lab. Need help with these 2 questions:
1-What other cations besides aluminum can be used to make alum crystals? Explain
2-Why we need to add sulfuric acid slowly to the solution as opposed to pouring it fast?
1-What other cations besides aluminum can be used to make alum crystals? Explain
2-Why we need to add sulfuric acid slowly to the solution as opposed to pouring it fast?
Answers
Answered by
DrBob222
1. Which alum are you preparing? There are several. You can read about them here. https://en.wikipedia.org/wiki/Alum
Generally, a monovalent cation sulfate with a trivalent cation sulfate + 12 mols H2O of crystallization. K, Na, Al, Fe, Cr, etc. I don't know what you used.
2. H2SO4 added to water USUALLY (unless the H2SO4 is very weak) gets quite hot. I've seen it get so hot that the solution spatters; i.e., the solution boils at the point of impact.
Generally, a monovalent cation sulfate with a trivalent cation sulfate + 12 mols H2O of crystallization. K, Na, Al, Fe, Cr, etc. I don't know what you used.
2. H2SO4 added to water USUALLY (unless the H2SO4 is very weak) gets quite hot. I've seen it get so hot that the solution spatters; i.e., the solution boils at the point of impact.
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