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    Photographic Print

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    Universal indicator pH scale The pH scale measures the strength of an acid or alkali When universal indicator is added to a solution it changes colour depending on the solutions pH The tubes contain solutions of pH to from left to right Acids increase in strength from pH to pH and alkalis increase in strength from pH to pH The green tube centre is neutral pH This image is a colourenhanced version of the actual pH scale see image A

    Work by Andrew Lambert

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