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A universal indicator is a pH indicator made of a solution of several compounds that exhibit various smooth colour changes over wider pH range values as the hydrogen ion concentration changes depending on the environment. The indicator itself can also be impregnated onto paper to form indicator strips. • A very strong acid (≤ 3) is red. A weak acid (4-6) is orange to yellow. A neutral solution (7) is green. A weak base (8-10) is blue. A strong base (≥ 11) is indigo/violet. • The colour range is
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Learn with us! Application of indicators. Acid-base indicators are valuable tools for chemists to determine the pH of a solution or to determine the endpoint of a titration. By observing the color changes of different indicators, we can gain insight into the properties of the solutions we are working with. In this lab, we explored the properties of various indicators and observed how they responded to different pH values. | The Oxford School, Dubai
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