MethodPart A - CorrosionOn the diagram below sketch the regions where colour has developed and what colour each region is for each test tube.Part A - CorrosionA1 - Preparation of Agar Gel [Student 1 does this WHILE STUDENT 2 IS DOING PART A2]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.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.)4.5.Move the Bunsen aside, add the agar to the water, and then resume heating with stirring until the agar has completelydissolved.iron nailiron + tiniron + zinciron + aluminiumiron + copper6.Turn off the Bunsen and add the NaCl to the hot solution and stir until it dissolves.Hint: there is no blue colour in the iron + zinc and iron +Add 2 mL phenolphthalein indicator and 1 mL 0.1 M potassium hexacyanoferrate(III) [K3Fe(CN),] (from step 2), stirthe solution well. The mixture should be yellow, not pink, green, blue, or colourless. Consult your demonstrator if themixture 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.7.aluminium test tubes (and the pink colour is around theiron nail in these test tubes).There's blue colour here.Galvanised ironiron or steel coated with zinc. From your observations, explain how galvanising iron will reduce corrosioneven if the zinc surface coating is damaged.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,SO, for about 2 minutes.Get a Bunsen burner, wire gauze and heat-proof mat. Boil about 50 mL of water in a 250 mL bcaker, 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.9.10. 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 thepiece 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.Based on your observations, would it be a good idea to use an iron bracket to hold a copper pipe to a wall? Explain whatwould happen.12. In a similar manner, punch holes in pieces of zinc foil, aluminium foil and copper foil and insert a cleaned nail into theholes. Place cach nail+metal into the appropriate labeled test tube (tubes 2-5).

Interpretation: 1. To explain how galvanized iron will reduce corrosion even if zinc surface coating…

Answered: Galvanised iron is iron or steel coated…

Galvanised iron is iron or steel coated with zinc. From your observations, explain how galvanising iron will reduce corrosion even if the zinc surface coating is damaged.

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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