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Acid-base indicators - explore some of the properties of selected acid-base indicators and measure the pH of some common solutions.
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Acid-base indicators - Experiment 3 Partners: Charlene Camilleri Karen Aguirre Steven Debincat Aim: In this practical you will explore some of the properties of selected acid-base indicators and measure the pH of some common solutions. Theory: The pH of a solution is a measure of the hydrogen ion concentration. A pH below 7 indicates an acidic solution, a pH greater than 7 indicates an alkaline solution, while a pH of 7 indicates a neutral solution. A range of indicators is used in chemistry because a particular indicator tells us a great deal about its chemical properties. Method: (part A) 1. Your teacher will provide a range of acid-base indicators in the laboratory. Indicators can be in paper of liquid form. (Eg. Methyl orange, phenolphthalein, universal indicator, litmus and bromothymol blue.) 2. Set up five test tubes in a rack, and then add about 2 ml of dilute hydrochloric acid (0.1 M) to each. To the first test tube add...
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