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    help please ???????? thank you



    Cresolphthalein is a common acid – base indicator which changes colour over with the pH range 8.2 – 9.8.

    Would cresolphthalein be a suitable indicator for the titration between 25.0 cm-3 of 0.1 mol dm-3 citric acid and 0.1 mol dm-3 ammonia? Explain your answer. What other method could be used to identify the end-point of this titration?
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    (Original post by bellanyash)
    help please ???????? thank you



    Cresolphthalein is a common acid – base indicator which changes colour over with the pH range 8.2 – 9.8.

    Would cresolphthalein be a suitable indicator for the titration between 25.0 cm-3 of 0.1 mol dm-3 citric acid and 0.1 mol dm-3 ammonia? Explain your answer. What other method could be used to identify the end-point of this titration?
    This is a weak acid-weak base titration, so titration is not suitable as this titration lacks the large pH change of other titrations where there's a distinctive verticle region in the graph. a pH probe can be used to measure the end point, as it continually measures pH over the entire scale.
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Updated: February 3, 2017
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“Yanny” or “Laurel”

The Student Room, Get Revising and Marked by Teachers are trading names of The Student Room Group Ltd.

Register Number: 04666380 (England and Wales), VAT No. 806 8067 22 Registered Office: International House, Queens Road, Brighton, BN1 3XE

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