pH at which it changes colour

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Presentation transcript:

pH at which it changes colour Indicators Different indicators change colour at different pHs. This means that not all indicators are suitable for distinguishing between solutions with different pHs. Indicator name pH at which it changes colour Colour at lower pH Colour at higher pH Methyl yellow 3.5 Red Yellow Bromocresol green 4.7 Blue Bromothymol blue 7.0 Phenolphthalein 9.3 Colourless Use the information above to work out the colour of the indicator at a particular pH: phenolphthalein at pH 11 bromocresol green at pH 3 Use the information to work out the best indicator to use to distinguish between: A solution with a pH of 4.0 and one with a pH of 5.0. A solution with a pH of 6.0 and one with a pH of 9. Would you be able to use phenolphthalein to distinguish between a solution with a pH of 11.0, and one with a pH of 12.0? Explain your answer.

pH at which it changes colour Indicators Answers Indicator name pH at which it changes colour Colour at lower pH Colour at higher pH Methyl yellow 3.5 Red Yellow Bromocresol green 4.7 Blue Bromothymol blue 7.0 Phenolphthalein 9.3 Colourless Use the information above to work out the colour of the indicator at a particular pH: phenolphthalein at pH 11 Red bromocresol green at pH 3 Yellow Use the information to work out the best indicator to use to distinguish between: A solution with a pH of 4.0 and one with a pH of 5.0. Bromocresol green A solution with a pH of 6.0 and one with a pH of 9. Bromothymol blue Would you be able to use phenolphthalein to distinguish between a solution with a pH of 11.0, and one with a pH of 12.0? Explain your answer. No, the indicator would be red in both solutions.