1.3 Determination Of The Formula For Magnesium Oxides

• What does magnesium form when it reaction oxygen

  magnesium’s oxide
• How can the emphiricla formula of magnesium oxide be determined…


  …. Accurate measuring of the mass of sample of magnesium, heating in air to form magnesium oxide, then accurately measure the mass of the product. Form these result using relative atomic mass the empirical formulas for magsium oxide can be determined
• The simple procedure to make magnesium oxide

  1. Measure mass of crucible and lid

  2. Put mg in crucible and measure the mass again

  3. Arrange the apparatus and heat the crucible strongly - raise the lid using tongs to let the O2 enter

  4. When reaction is nearly completed place the lid on heatproof mat and strong heat crucible for 5 minutes - tap magnesium allow tongs to break the reside

  5. Allow crucible and lid to cool and then reqeight the crucible its content and with lid.
• Result table for the calculated mass of Mg, O and MgO and also the mole to determine the empirical formula Mg = 0.23, O = 0.10


  Answer:

  
• EO - why you need to left the lid form time to time

  EO - why you need to left the lid form time to time
• EO - point of breaking the magnsum oxide residue while ehalthing strongly for 5 minute 


  Allow for the unreacted magnesium to fully react wit the oxygen in air
• EO - the formula worked out from this reaction shows less oxygen than in pure magnesium why?


  Maybe due to not all the magnesium had been reacted
• EO - To form magsium nitrate you can strongly heat it with pure magnesium. This compound is black colour. Btu sometimes contaminate the MgO formed in this practical a) why does Mg react with oxygen rather than nitrogen?


  Because formation of magnesium nitrate require high temperature than magnesium oxide so before it react with nitrogen the mg react with oxygen.
• EO - To form magsium nitrate you can strongly heat it with pure magnesium. This compound is black colour. Btu sometimes contaminate the MgO formed in this practical b) 1.82 g of Mg react to form 2.52 g of magnesium nitride. Calculate the empirical formula 


  Answer