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Analysis of unknown aqueous solutions.
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| Submitted: Fri Feb 06 2004
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SECTION A - analysis of unknown aqueous solutions BIBLIOGRAPHY: 1. Cambridge Advances Sciences (endorsed by OCR) Chemistry 1 (pg 129) 2. Acids, Bases and Salts - Chemlab (pg 24/25) 3. Chemistry in Context (3rd edition) by Graham Hill & John Holman (pg 101) 4. http://www.cs.moravian.edu/~langhus/courses/quant/problems/abtitn/abtitn.html 5. http://www.wpbschoolhouse.btinternet.co.uk/page13/ChemicalTests.htm Aqueous Calcium Hydroxide Carbon dioxide is easily identified using a solution of calcium hydroxide (limewater). When carbon dioxide is bubbled through limewater, it turns cloudy (formation of calcium carbonate precipitate). Ca(OH) (aq) + CO2 (g) --> CaCO3 (s) + H2O (l) EQUIPMENT: 1. 5 straws 2. 5 solutions (each in a test tube) METHOD: 1. Carefully blow into each solution 2. The one that turns cloudy will be calcium hydroxide Ethanoic Acid When ethanoic acid is warmed with ethanol (in presence of a strong acid catalyst) ethyl ethanoate is formed. During this reaction, the O-H bond in ethanol is broken. CH3CH2OH + H3C-C-OH H3C-C-OCH2CH3 + H2O EQUIPMENT: 1. 5 solutions (each in a...
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