Chemistry Lab
When comparing the results of the flame tests for solid sodium nitrate, solid sodium chloride and the sodium chloride solution, they all gave off the same colour. These results indicate that it does not matter which state the compound is in; it will still have the same properties. It also indicates that the wavelength was the same for sodium chloride and the sodium nitrate. Which means that it is the metal (sodium) that is responsible the new colour, not the non-metal (nitrate or chloride). Potassium chloride and sodium chloride gave off similar colours - orange. They were hard to tell apart by viewing them with the naked eye, but because they are different metals it is known that the shade in colour (orange) would be slightly different. It looked as though sodium chloride gave off a slightly lighter orange - almost yellow. In this experiment cobalt glass was not used.
Only one example of the difference between chloride and nitrate was needed, which proved that it is the metal that is creating the colour. This is because there was no difference in colour between the two compounds. Two sodium compounds were used because the sodium chloride was more difficult to pick up with the Nichrome Wire than the sodium nitrate was. Furthermore, two sodium compounds were used to prove the point that it is the sodium creating the colour, not the non-metal (chloride or nitrate). This may have occurred by a spill as certain compounds were held over top of it. For unknown metallic compounds:Orange Flame: Potassium Blue Flame: Copper (II) Yellow Flame: SodiumRed Flame: Lithium All of the compounds were chlorides except for one because the non-metal is not responsible for the colour change. This would have resulted in a faulty Identification Key, which would not help when trying to identify an unknown substance. In this case nitrate made it easier, so it was used. If all of the other compounds containing chloride were tested again when containing nitrate, they would all give off the same colour as they did before. This was proved from the similarities in the flame colour for sodium chloride and sodium nitrate. Identification Key:Sodium Orange/YellowStrontium Pink/RedPotassium OrangeCopper (II) Green/BlueLithium RedCalcium Bright Orange CONCLUSION:The chart of known flame colours (identification key) was completed because most compounds clearly produced different colours in the flame. The results from testing sodium chloride and sodium nitrate showed that the metal is responsible for creating the colour. Furthermore, the solid sodium chloride and sodium chloride solution test also proved that the state the compound is in does not matter, it will still produce the same colour. In this lab there may have been many reasons for error. This is because there was no difference in colour between the two compounds.
Common topics in this essay:
Nichrome Wire,
,
Identification Key,
Flame Lithium,
Orange CONCLUSION,
sodium chloride,
chloride sodium,
sodium chloride sodium,
sodium nitrate,
identification key,
chloride sodium nitrate,
chloride sodium chloride,
colour compounds,
solid sodium,
creating colour,
naked eye,
copper ii,
difference colour compounds,
Copper II,
colour sodium,
solid sodium chloride,
|
Acceptance Essays
