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Observing Reactions of Sulfuric Acid

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Observing Reactions of Sulfuric Acid
Assessment task 3 oral presentation summary
Description of the experiment * Aim: To observe the reactions of sulfuric acid as an oxidising agent and as a dehydrating agent.
Equipment:
* 20mL of concentrated sulfuric acid * 20mL of 2mol/L sulfuric acid * 2 small pieces of each of copper, zinc and iron * Sandpaper * 10 test tubes * Test tube rack * 2g of sugar crystals (sucrose) * 2 wooden ice-cream sticks * 10mL measuring cylinders
Steps:
A: Sulfuric acid as an oxidising agent 1. Clean pieces of metal with sandpaper to remove oxide coating. 2. Add a piece of each metal to a separate test tube. 3. Add 5mL of concentrated sulfuric acid to each test tube. 4. Record the observations. 5. Repeat the experiment with 2mol/L sulfuric acid.
B: Sulfuric acid as dehydrating agent 1. Place 1g of sugar (sucrose) and a wooden ice-cream stick into separate test tube. 2. Add 1-2mL of concentrated sulfuric acid to each test tube. 3. Record the observations. 4. Repeat the experiment with 2mol/L sulfuric acid

Risk assessment * Conc. sulfuric acid is highly corrosive * If conc. Sulfuric acid is spilt, do not add water * Hydrogen sulfide gas

Results | Observations | | Conc. Sulfuric acid | 2 mol/L sulfuric acid | Copper | No observable change | No observable change | Zinc | No observable change | No observable change | Iron | * Exothermic reaction * Bubbling gas | No observable change | Sugar | * Exothermic reaction * Black solid is produced and pushed out from the test tube * Gas with rotten egg smell is released | No observable change | Wood | * Black layer is formed on the wood | No observable change |
Validity and reliability * Experiment was not repeated * Low reliability * Results not consistent with the known theory * Invalid * Require to eliminate experimental errors

Analysis of the results
HSC syllabus


Bibliography: 1. 2012books.lardbucket.org (n.d.) Untitled. [image online] Available at: http://2012books.lardbucket.org/books/general-chemistry-principles-patterns-and-applications-v1.0/section_18/65faa2f875a51b122536441d9c6a90d2.jpg [Accessed: 14 May 2013]. 2. angryewan (2008) Sulfuric acid in sugar. [video online] Available at: http://www.youtube.com/watch?v=_gG0UAX3V7c [Accessed: 14 May 2013]. 3. cellbiologyolm.stevegallik.org (n.d.) Untitled. [image online] Available at: http://cellbiologyolm.stevegallik.org/sites/all/images/sucrose.png [Accessed: 14 May 2013]. 4. Tregarthen, L. (2003) HSC Chemistry. 3rd ed. South Yarra: Macmillan Education Australia Pty Ltd, p.P.118-119. 5. www.docbrown.info (n.d.) Untitled. [image online] Available at: http://www.docbrown.info/page04/OilProducts/esterprep1.gif [Accessed: 14 May 2013]. 6. www.weneedsigns.com (n.d.) Untitled. [image online] Available at: http://www.weneedsigns.com/images/C/Danger%20Sulfuric%20acid.jpg [Accessed: 14 May 2013].
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