• Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

Objective: To investigate the order of oxidizing ability of the halogens Cl2, Br2, and I2 in aqueous solution

Extracts from this document...

Introduction

Name: Subasri Thomas Name of lab partner: Ranjini Sri Naransamy Date: 3/7/2012 Title: Halogen ? halide reactions in aqueous solution Objective: To investigate the order of oxidizing ability of the halogens Cl2, Br2, and I2 in aqueous solution Apparatus / Materials: Test tubes, Bromine water ,Br2(aq) ,Chlorine water, Cl2(aq), Iodine solution,I2 (in KI aq),Potassium Bromide solution( KBr),Potassium chloride solution(KCl), Potassium iodide solution(KI),Hexane(C6H14) Procedure: 1. Reaction (if any) of iodide with chlorine and bromine 1. About 1mL of Potassium iodide solution is added to each of two test tubes 2. About the same volume of chlorine water is added to one of these tubes and the other was added with the same volume of bromine water 3. The test tubes is shake and the color changes is noted-(if any) 4. A few drops of hexane is added to each tube, shake and allow it to settled and the color of each layer is noted. 5. Reaction that taken place is observed and a copy of result is completed in table 11.1. 1. Reaction (if any) of bromide with chlorine and iodine 1. About 1mL of Potassium bromide solution is added to each of two test tubes 2. ...read more.

Middle

orange purple lower X Light yellow light red Conclusion X No visible reaction observed No visible reaction observed Discussions: Halogens act as oxidizing agents (electron acceptors) in the majority of their reactions. X2 + 2 e 2 X-(aq) When going down the group, the atomic size increases. As the atomic size increases, the ns2np5 valence electron in outermost shell is further apart from the nucleus. Thus the electronegativity decreases down the group. As the electronegativity decreased the oxidizing power of the halogens also decreases because of the size of the element and the electron affinity as well as hydration energy decreases. The halogens which are higher in the group can oxidize halide ions lower in the group. The arrangements of elements of group 17 according to periodic table is Fluorine,Chlorine,Bromine,Iodine and Astatine. Since Fluorine, F2 is higher in the group it is the strongest oxidizing agent in halogens group. It can oxidize chloride ion. This is obviously a redox reaction in which oxidation and reduction occurs simultaneously. F2 + 2 Cl- 2 F- + Cl2 In this experiment iodide reacted with chlorine and bromine water. ...read more.

Conclusion

In the reaction of iodide ions with chlorine and bromine, iodine has been extracted from the solution after adding hexane. That means iodide ion is displaced by chlorine and bromine. For the reaction of bromide ion with chlorine and iodine, only Br2 will extracted from chlorine solution after shake with hexane, and the bromine ions cannot be displaced by iodine because of the oxidizing power. For the reaction between chloride ion with bromine and iodine, there has no any reaction occur, and the bromine and iodine are extracted from both solutions respectively. From there, it can know that chloride ions cannot displace by any of bromine and iodine. Hence, the strongest oxidizing agent is chlorine, follow by bromine and iodine. I2 < Br2 < Cl2 Questions: 1. 1. I2 (aq KI) does not oxidize Cl- (aq)and Br-(aq) 2. Br2 (aq) does not oxidize Cl- (aq) but oxidize I-(aq) 3. Cl2 oxidize Br-(aq) and I-(aq) 2. 1. Chlorine can oxidized the bromide ions in potassium bromide aqueous solution and also iodide ions in potassium iodide aqueous solution. 1. Cl2 + 2Br- 2Cl- + Br2 2. Cl2 + 2I- 2Cl- + I2 1. Bromine can oxidized the iodide ions in potassium iodide aqueous solution 1. Br2 + 2I- 2Br- + I2 3. ...read more.

The above preview is unformatted text

This student written piece of work is one of many that can be found in our International Baccalaureate Chemistry section.

Found what you're looking for?

  • Start learning 29% faster today
  • 150,000+ documents available
  • Just £6.99 a month

Not the one? Search for your essay title...
  • Join over 1.2 million students every month
  • Accelerate your learning by 29%
  • Unlimited access from just £6.99 per month

See related essaysSee related essays

Related International Baccalaureate Chemistry essays

  1. To Investigate the Effectiveness of Antacid products you can buy

    Hydrochloric acid is a strong acid of pH1 so most indicators can be used in this experiment. An indicator is usually a weak base or acid and is coloured, which will change when the pH of the solution it is added to changes. HIn (aq) H+ (aq) + In- (aq)

  2. Aim: Using an iodine clock reaction to find the order of hydrogen peroxide and ...

    for Experiment 7 Volume of H2O2 ml, �0.5 Volume of CH3COOH ml, �0.5 Volume of Water ml, �0.5 Rate , cm3/s �31% 10 4 6 0.312 Volumes of Reactants and Rate for Experiment 8 Volume of H2O2 ml, �0.5 Volume of CH3COOH ml, �0.5 Volume of Water ml, �0.5 Rate

  1. IB questions and answers on Atomic Theory

    Why are all ions formed in a mass spectrometer positively charged? the particle that experiences the most deflection is the one with the lowest m/z (mass/charge ratio), which in this group is 16O2+ (m/z of 8). Ions in a mass spectrometer are positively charged because the particles are stripped of electrons in the ionization step 11.

  2. Experiment to investigate the stoichiometry of the reaction between copper metal and aqueous silver ...

    One Day Later 11) Dry the beaker and weigh when cool and dry. Results: Object Mass in grams ( 0.01g) Mass of beaker 116.79 Mass of copper before immersion in solution 0.44 Mass of copper at the close of the experiment 0.12 Mass of beaker plus silver 117.80 Observations Day 1: The copper was initially a pink color.

  1. Aim To investigate the chemical properties of alcohol

    drops of concentrated sulphuric acid A colourless compound with a fruity smell is produced. 4. 10 drops of ethanol + 10 drops of 2-hydroxybenzoic acid + 6 drops of concentrated sulphuric acid A colourless compound is produced that gives a balm type odour.

  2. Using Redox Titration to Analyze the Oxidizing Strength of Bleach Lab

    titre M = n/v M = 0.0003 moles/ 0.01525 dm3 M = 0.019672131 mol dm-3 The following table shows values from part two of the calculations which are for determining the oxidizing power of bleach. (Trial) Titration 1 � 0.05 cm3 Titration 2 � 0.05 cm3 Titration 3 � 0.05

  1. Trends across group 2 elements

    Add 2 mL of barium chloride (solution of Ba2+ ions, concentration 0.1 M) to each of the test tubes.

  2. The chemistry of atmospheric and water pollution.

    + ClNO3 (g) ï Cl2 (g) + HNO3 (g) This has no effect upon ozone levels in winter but when arrives in spring, the UV rays from the sun splits the chlorine molecule to form 2 chlorine free radicals which are able to destroy thousands of ozone molecules.

  • Over 160,000 pieces
    of student written work
  • Annotated by
    experienced teachers
  • Ideas and feedback to
    improve your own work