Effect of Acids and Bases Essay

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Effect of Acids and Bases

Experiments to Determine the Effect of Acids & Bases on Different Indicators and the pH of Common Cleaning Agents

The aim of the first set of experiments is to find out and record the colour changes that are observed after a certain indicator is mixed with acids and bases to form a colour reaction. Once the selected indicator has been mixed with a acid that is both weak and strong and a base/alkali that is both weak and strong we are to record the colour and choose another indicator. The purpose of this experiment is to find out what indicators are sensitive to what areas of the pH colour spectrum, while also looking how Universal Indicator covers most areas of the pH spectrum generally but much less
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Then a white tile was placed on the bench and then one drop of the chosen strong acid, Hydrochloric Acid 2M ( HCI ) was placed on the tile using an eyedropper. Then one drop of Phenolphthalein was placed on the tile so that it landed in the previous drop of Hydrochloric Acid. This colour reaction was noted and then recorded on a results sheet.
The tile was then placed under a fair quantity of water to clean it and then was dried off with some paper towel. Following the same steps as before one drop of the chosen weak acid, Sulfuric Acid 1M ( H2SO4 ) was placed on the tile using an eyedropper. Then one drop of Phenolphthalein was placed on the drop of Sulfuric Acid and the colour was noted and recorded on a results sheet. The tile was then washed after every pH sample to ensure that there was no contamination from other chemicals. The Phenolphthalein indicator was then tested with the chosen strong base, Sodium Hydroxide 2M ( NaOH ) and the chosen weak base, Sodium Hydroxide 1M. The indicators, Phenol Red, Methyl Red, Methyl Orange, Beomothymol Blue, Universal Indicator and Congo Red were then tested following the acids and bases as above. The

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