pH scale and indicators
Lesson 9 / 19
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I can explain the pH scale and appropriately use universal indicator, phenolphthalein, methyl orange, and litmus and pH meters to identify different solutions.
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The pH scale ranges from 0 to 14, indicating how acidic or basic a substance is.
Universal indicator provides a full range of colours corresponding to different pH levels, and this can be a limitation.
Phenolphthalein changes from colourless to pink in alkaline conditions.
Methyl orange shifts from red in acidic conditions to yellow in basic conditions.
Litmus paper turns red in acidic conditions and blue in basic conditions, the solution will be purple when neutral.
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