MethodPart A - CorrosionMy partner for this part was:Part A - CorrosionA1 - Preparation of Agar Gel [Student 1 does this WHILE STUDENT 2 IS DOING PART A2]On the diagram below sketch the regions where colour has developed and what colour each region is for each test tube.1.On separate watch glasses weigh 0.8 g of agar and 5.0 g of NaCl using top loading balances.Thoroughly rinse a 10 mL measuring cylinder and two tall, narrow test tubes. Use the measuring cylinder to dispense 2mL of phenolphthalein solution into one test tube and 1 mL 0.1 M potassium hexacyanoferrate(III) [K,Fe(CN),] intothe other test tube, ready for step 7 below.2.3. Wash a 250 mL beaker with a little detergent and rinse well before use.4.Get a Bunsen burner, wire gauze and heat-proof mat and heat to boiling about 100 mL of demineralised water in thecleaned 250 mL beaker. (Remember: the gas tap is yellow.)5.Move the Bunsen aside, add the agar to the water, and then resume heating with stirring until the agar has completelydissolved.6. Turn off the Bunsen and add the NaCl to the hot solution and stir until it dissolves.iron nailiron + tiniron + zinciron + aluminiumiron + copperAdd 2 mL phenolphthalein indicator and 1 mL 0.1 M potassium hexacyanoferrate(III) [K,Fe(CN)] (from step 2), stirthe solution well. The mixture should be yellow, not pink, green, blue, or colourless. Consult your demonstrator if the7.mixture is not yellow. Allow the mixture to cool to room temperature before proceeding to part A3. The solution youhave prepared will give a blue colour with Fe2+ (ferrous) ions and a pink colour with OH- (hydroxyl) ions.Hint: there is no blue colour in the iron + zinc and iron +aluminium test tubes (and the pink colour is around theiron nail in these test tubes).There's blue colour here.A2 – Cleaning the Iron Nails [Student 2 does this WHILE STUDENT 1 IS DOING PART A1]8. Place 5 iron nails into one test-tube containing 15 mL of 2 M H,SO4 for about 2 minutes.Use your observations to complete the following table. The first line has been completed to show you what is required.Get a Bunsen burner, wire gauze and heat-proof mat. Boil about 50 mL of water in a 250 mL becaker, decant (pour off)the acid from the nails in the previous step, rinse them several times with tap water and then carefully add them to theboiling water. After 1 minute (no longer!) turn off the bunsen. Remove the nails one at a time as required, using tongs.9.Metal(s) Presence and Presence andlocation ofblue colourlocation oflonic equationspink colourOxidation reactionReduction reaction10. Rinse five regular test tubes several times each with water. Label them 1-5. In tube 1 place one of the cleaned nails. Intubes 2-5 you will place a cleaned nail wrapped in a piece of metal (as described below), and it is important that theFels) → Fe (aq) +2e0,(aq) + 2H,0(1) + 4e4OH (aq)Fealong the shafttip and headpiece of metal fits tightly around the nail.11. Using a fresh nail (NOT ONE CLEANED IN THE STEPS ABOVE) and a hammer, punch a hole in a piece of tin foiland then insert one of the cleaned nails through the hole, making sure there is good contact between the nail and tin.Fe/Sn12. In a similar manner, punch holes in pieces of zinc foil, aluminium foil and copper foil and insert a cleaned nail into theFe/Znholes. Place cach nail+metal into the appropriate labeled test tube (tubes 2–5).Fe/AlFe/CuBased on your observations, which of the metals (Sn, Zn, Al, Cu) inhibited the corrosion of the iron?.

Interpretation: To complete the table for oxidation and reduction reaction equations.

Use your observations to complete the following table. The first line has been completed to show you what is roquired. Metal(s) Presence and Presence and location of blue colour location of lonic equations pink colour Oxidation reaction Reduction reaction Fe(s) Fe"(aq) +2e Oz(aq) + 2H,0(1) + 4c¯-+40H (1q) Fe along the shaft tip and head Fe/Sn Fe/Zn Fe/Al Fe'Cu Based on your observations, which of the metals (Sn, Zn, Al, Cu) inhibited the corrosion of the iron?.

Use your observations to complete the following table. The first line has been completed to show you what is roquired. Metal(s) Presence and Presence and location of blue colour location of lonic equations pink colour Oxidation reaction Reduction reaction Fe(s) Fe"(aq) +2e Oz(aq) + 2H,0(1) + 4c¯-+40H (1q) Fe along the shaft tip and head Fe/Sn Fe/Zn Fe/Al Fe'Cu Based on your observations, which of the metals (Sn, Zn, Al, Cu) inhibited the corrosion of the iron?.

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter1: Chemical Foundations

Section: Chapter Questions

Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...

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