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Welcome to Sambal’s Blog. This is where you can get help with your science Key Stage 3. Actually, anybody can ask a question here. We will do our best to give you an answer providing your question is specific. We don’t have time to ask open ended questions: remember, we have lives to live and lots of other things to do.

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2 Responses to Front Page

  1. carlajane says:


    I was wondering could you please explain the role of indicators (not just universal indicator)? Please could it be a year 10 standard! 🙂


    • Universal indicator is a mixture of different indicators, so it will change colour according to pH. In fact, it will have a whole range of different colours as pH changes from 1 to 14. This is not a very exact way of measuring pH.

      An individual indicator only has two states: the colour in acid and the colour in alkali, with a very exact change between the two. Have a look at the table on my pH page. Use the main menu at the top of this page. pH drops down from Chemistry.

      E.g. at pH 9.7 Phenolphthalein changes from colourless to red-pink. Litmus changes from red to blue at pH 7.0 Nowadays we can measure pH much more accurately using an electronic pH meter.

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