An ____ is a substance that changes ____ when it is added to ____ or ____ solutions. You can prepare homemade indicators from red cabbage or beetroot juice - these will help you see if a solution is acidic or alkaline. Universal indicator can show us how strongly acidic or alkaline a ____ is, not just that the solution is acidic or alkaline. This is measured using the pH scale, which runs from pH ____ to pH ____. Universal indicator has many different colour changes, from ____ for strongly acidic solutions to dark ____ for strongly alkaline solutions. In the middle, neutral pH 7 is indicated by ____. These are the important points about the pH scale: * neutral solutions are pH 7 exactly * acidic solutions have pH values ____ than 7 * alkaline solutions have pH values ____ than 7 * the closer to pH 0 you go, the more strongly acidic a solution is * the closer to pH 14 you go, the more strongly alkaline a solution is

Indicators

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