18.3/R3.1.14 Explain how the pH range of an indicator relates to its pKa value [HL IB Chemistry]

If you have chosen your indicator wisely then it will change colour when the acid/base reaction is over (at equivalence point). So find and indicator with pka = pH of your reaction at equivalence point. At this pH the both colours of the indicator will be at equal concentration = colour change.

[mominahussain]

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[tanvirlatif]

You are the world's greatest human being

[davidneese]

Thank you so much - I got this in your 2 minute video better than everything I've looked at in the past hour combined searching for this answer!

[tafheemanjum]

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[xavierroberto]

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[ibchemvids]

At equivalence pH should equal pH of the indicator

At half-equivalence the pH = pKa of the weak acid in your titration.

[steldodd]

Thankyou! I'm currently studying my first year of chemistry at Warwick university and was super stuck on this - that cleared all my questions up really quickly :)

[iGohar]

You said in a pervious video that at the half equivalence point the pH at that point is equal to the pKa. Therefore, shouldn't we be looking at the pH at the half equivalence point and then comparing that to the pKa values for the indicators?

We said Ka = [H+] at color change. That occurs at half equivalence point if I am not mistaken.

[DewyPeters]

Would you say this topic (acids and bases overall) is the hardest?

[СоломияНовицкая]

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