ph curves indicators Watch

Bertybassett
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For q3d on this, is there an actual method for doing this? Like the way I do it is assume that strong acids have ph 1, weak acids ph 5, weak bases ph 9 and strong bases ph13 and then try and sketch a ph curve and find an indicator that has a range in the "vertical region" of the sketch. However, this method is quite bad as often it's difficult to determine where exactly the vertical region starts and ends? Is there another better method to do these? https://pmt.physicsandmathstutor.com...s%201%20QP.pdf
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charco
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(Original post by Bertybassett)
For q3d on this, is there an actual method for doing this? Like the way I do it is assume that strong acids have ph 1, weak acids ph 5, weak bases ph 9 and strong bases ph13 and then try and sketch a ph curve and find an indicator that has a range in the "vertical region" of the sketch. However, this method is quite bad as often it's difficult to determine where exactly the vertical region starts and ends? Is there another better method to do these? https://pmt.physicsandmathstutor.com...s%201%20QP.pdf
You don't need any numbers, just the general shape of weak acid - strong base titrations (and the other possible combinations)

Check out this page https://www.ibchem.com/IB16/08.82.htm
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Bertybassett
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yes but what im saying is I know the general shapes, i'm just saying that this method doesn't always make it clear as to why indicator to use.
(Original post by charco)
You don't need any numbers, just the general shape of weak acid - strong base titrations (and the other possible combinations)

Check out this page https://www.ibchem.com/IB16/08.82.htm
You will need to activate flash ...
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charco
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(Original post by Bertybassett)
yes but what im saying is I know the general shapes, i'm just saying that this method doesn't always make it clear as to why indicator to use.
No specific numbers needed:
Weak acid - strong base ===> inflexion in the basic pH range 7-10
Strong acid - weak base ===> inflexion in the acidic range 4-7
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Bertybassett
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thanks, how about for weak acid/ weak base?
(Original post by charco)
No specific numbers needed:
Weak acid - strong base ===> inflexion in the basic pH range 7-10
Strong acid - weak base ===> inflexion in the acidic range 4-7
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charco
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(Original post by Bertybassett)
thanks, how about for weak acid/ weak base?
Can't be titrated ...
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