Introduction
Alum is a double salt that is obtained from aluminum. It is used in pickling process and the dying of various fabrics by recycling aluminum useful products can be obtained from previous material generally regarded as refuse.
Materials
Aluminum foil, aqueous solution of KOH
Procedure
Dissolve aluminum foil in hot aqueous solution of KOH.
The solution will acidify until a precipitate will be recovered (alum)
Re-crystallize the precipitate to eliminate impunities.
Results
Group 1
- Na + O2→Na2O2
- Na2O2 +2H2O→H2O2+2NaOH
- Cesium would be more reactive than sodium.
Group 2
- 2Mg + O2→2MgO
- Magnesium oxide + water →Mg(OH)2
- BaO+ H2O→ Ba(OH)2
- BaO is more reactive than MgO
- Mg reacted with HCL whereas it did not react with NaOH
Group 3
- AL is more reactive compared to Mg and Na.
- 4AL+ 3O2→2AL2O3
- 2AL +HCL→2ALCL+ 3H2
- AL+NaOH+H2O→NaAL(OH)4 (sodium tetrahydroxaluminate)+3H2
- Aluminum oxide is an acid.
Group 4
- C+O2→CO2; oxide +H2O: H2 CO3
- carbon is a non metallic substance while lead is a soft malleable metal.
Group 6
- S+O2→SO2; oxide +water: SO2+H2O:H2SO3
Most metallic group =1
Most non metallic group=7
Find amphoteric in 3 and 4 in a period
Conclusion
The lab session was successful because the acceptable products were obtained. This indicates that recycling of aluminum can result to an advantageous element.
Works Cited
A, grossie D. laboratory guide for chemestry. dayton: Wright state University, 2011.(print)
Williamson, Vickie M. Experiments in General Chemistry: Inquiry and Skill Building. United states of America: Cengage Learning, 2008.(print)
