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Year 11 Chemistry Open-Ended Investigation
Chemistry
6 Pages • Essays / Projects • Year: Pre-2020
Research Chemistry tests info pH Test The pH test operates the properties of the universal indicator which is a weak (usually organic) acid that changes its molecular shape with changes in pH. As the shape changes the colour of the solution changes as well and it indicates a pH value range of 1-14. Iodine Test The iodine test is used to test the presence of starch. It works as iodine is an aqueous solution with dissolved potassium iodide (KI) that reacts with starch, producing a purple black colour. Vinegar Test The vinegar test is an example of a neutralisation reaction. This is where an acid reacts with a base and cancels each other out, creating a type of salt and water (H2O). It is also a chemical reaction. Vinegar Test Equation McKenzies Bicarb Soda CH3COOH + NaHCO3 NaCH3COO + H2O + CO2 Acetic acid + Sodium bicarbonate Sodium acetate + Water + Carbon dioxide Chromatography Info Chromatography is used to separate mixtures of substances into their components and all forms of chromatography work on the same principle. They all have a stationary phase (a solid, or a liquid supported on a solid) and a mobile phase (a liquid or a gas). The mobile phase flows through the stationary phase through capillary action and carries the components of the mixture with it. Different components travel at different rates. In paper chromatography, the stationary phase is an absorbent paper and the mobile phase is a suitable liquid solvent or mixture of solvents.
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