chem lab 32

chem lab 32 - chloride or aluminum 6. sodium hydrogen...

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1. identify whether unknown is a liquid or a solid 2. solubility in water a. aluminum=soluble b. sodium hydrogen carbonate=soluble c. barium chloride=soluble d. ammonia=soluble e. formic acid=soluble f. sodium hydroxide=soluble g. hydrochloric acid=soluble h. iron (iii) chloride=soluble i. ethanol=soluble j. hexane=insoluble k. urea=soluble l. potassium sulfate=soluble 3. pH determination (possibly eliminate sodium hydroxide and ammonia) 4. mix the unknown with Barium Chloride…if it precipitates, the unknown is potassium sulfate 5. add sodium hydroxide to unknown…if it precipitates it could be iron
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Unformatted text preview: chloride or aluminum 6. sodium hydrogen carbonate bubbles with addition HCl, doesnt bubble=barium chloride 7. test conductivity to see if unknown is ionic or covalent a. aluminum=conduct b. sodium hydrogen carbonate=conduct c. barium chloride=conduct d. ammonia=no e. formic acid=no f. sodium hydroxide=conduct g. hydrochloric acid=conduct h. iron (iii) chloride=conduct i. ethanol-no j. hexane-dont need to do k. urea-no l. potassium sulfate-conduct 8. barium burns green; potassium sulfate burns violet; ethanol burns blue 9....
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