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Objective: To determine the content of oxygen absorber in a moon cake package.

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Introduction

Working Plan : Investigation of the content of oxygen absorber Objective: To determine the content of oxygen absorber in a moon cake package. Introduction: According to the information on the internet, there are iron powder (or iron compound), sodium chloride and sodium carbonate. Then we are going to use different methods to test whether those substances are present in the oxygen absorber or not. Chemicals: 0.4M Sodium hydroxide (NaOH) 1M Sulphuric acid (H2SO4) 0.05M Silver nitrate (AgNO3) 1M Nitric acid (HNO3) 1M Hydrochloric acid (HCl) Lime water Oxygen absorber Potassium manganate(VII) solution about 10 cm3 about 20 cm3 about 5 cm3 about 5 cm3 about 10 cm3 about 5 cm3 2-3 packs Apparatus: Test tubes Test tube rack Dropper Glass rod 100 cm3 beaker Filter funnel Filter paper Bunsen burner Platinum wire White tile delivery tube paper 4 pieces 1 piece 1 ...read more.

Middle

Iron is reacted with acid and form green iron(II) ions. A yellow solution may formed, as iron(III) ions are presented. A dirty green precipitate formed when sodium hydroxide solution is added to the mixture, it is used to show the presence of iron ions. If there are iron(III) ions, a reddish brown precipitate is formed. 1.Acidified the Potassium manganate(VII) solution by adding the 1M nitric acid. 2. Open a pack of oxygen absorber,and pour the substances into the test tube with the 1M sulphuric acid. 3. Add the acidified potassium manganate(VII) solution into a test tube drop by drop.Record the observable change of the solution. Expection: The acidified potassium manganate(VII) solution would be decolourized.As the oxygen absorber contain iron which react with the acid to form iron(II) ...read more.

Conclusion

Then record the flame colour. Expectation: If sodium ions are presented, a golden-yellow flame would be observed. C. Test for carbonate 1. Open a pack of oxygen absorber and put it into a test tube 2. Add about 5 cm3 lime water into another test tube. 3. Add 1M sulphuric acid into the test tube which place with oxygen absorber. 4. Stopper the test tube with oxygen absorber and sulphuric acid, then place the delivery tube between it and the test tube with lime water. 5. Record the observable change. Expection: If carbonate is present in the oxygen absorber, carbon dioxide would be produced when dilute sulphuric acid is added. Then, the lime water would change from colourless to milky. The iron powder would be the main content of oxygen absorber for its function, the rusting of iron allow oxygen and moisture to enter but does not allow they to leak out. ...read more.

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