Exp 7 Flashcards
14 reagents used in exp 7?
- 0.2 M Bi(NO3)3
- 0.2 M Cd(NO303
- 0.2 M Cu(NO3)2
- 0.2 M Sb(NO3)3
- 0.2 M Sn(NO3)2
- 6M (NH4)2S
- 6 M NH4Cl
- 6 M HNO3
- 6M H2SO4
- conc. NH3
- Na2SnO2
- conc. HCl
- 1M oxalic acid
- thioacetamide
- 0.1 M AgCl2
13 materials used in exp 7
- 5 centrifuge tubes
- 5 small test tubes
- glass stirring rod
- small 10-mL graduated cylinder
- water bath
- wire gauze
- tripod
- small watch glass
- dropper pipets
- litmus paper
- wash bottle filled with deionized water
- centrifuge machine
- Bunsen burner
Exp 7 procedures:
1. Place ___ drops of each of the following aqueous solutions to separate centrifuge tubes: 0.2M Bi(NO3)3, 0.2M Cd(NO3)3, 0.2M Cu(NO3)2, 0.2M Sb(NO3)3, 0.2M Sn(NO3)2. Then add 5 drops of freshly prepared ________ to each centrifuge tube. Record your
observation.
- 20
- 6M (NH4)2S
Exp 7 procedures:
2. Centrifuge the mixtures and decant the supernatant liquid. Wash each of the precipitates with 1 drop of _____ and ___ drops of ______.
6 M NH4Cl and 20 drops of deionized water
Exp 7 procedures:
3. To the washed precipitates containing Bi3+, Cd3+ and Cut2, add ___ drops of ____ and ___ drops of ______. Stir and boil the mixture in a hot water bath for 5 minutes.
- 10 drops of DI water
- 10 drops of 6M HNO3
Exp 7 procedures:
4. Centrifuge and decant the supernatant solution from procedure 3. Discard the precipitates. To each of the supernatant liquid, add 6 drops of _____. Allow the
mixtures to cool and 5 drops of DI water.
6M H2SO4
Exp 7 procedures:
5. To the mixtures in procedure 4, add few drops of concentrated ___ until the solution becomes_____. Confirm using a litmus paper. Record your observation.
NH3, basic
Exp 7 procedures:
6. To the centrifuge tube containing Bi3+, centrifuge and decant the supernatant liquid. To the precipitate, add a few drops of ________. Record your observation.
freshly prepared sodium stannite reagent
Exp 7 procedures:
7. To the solutions containing Sb+3 and Sn+2, add _____ drops of _____ and place in a hot water bath until the precipitates dissolve.
15 to 20 drops of concentrated HCI
Exp 7 procedures:
8. Add _______ to each centrifuge tubes. To the solution containing Sb+3, add _________ and _____ and warm in the water bath.
- 1 mL of DI water
- 8 drops of 1M oxalic acid
- 2 drops of freshly prepared thioacetamide solution
Exp 7 procedures:
9. To the solution containing Sn+2, add _____. Record your observation
0.1 M of AgCl2
