Problem: The following drawings represent solutions at various stages of the titration of a weak acid, HA, with NaOH. (The Na+ ions and water molecules have been omitted for clarity.) To which of the following regions of the titration curve does each drawing correspond.(iii)

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We are asked which of the following regions of the titration curve does each drawing correspond


1) before addition of NaOH

  • The solution should be mostly HA.


before addition of NaOH: image (iii) 



2) after addition of NaOH but before equivalence point

  • HA should be lessened and A- should start to appear

after addition of NaOH but before equivalence point: image (i) 


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Problem Details

The following drawings represent solutions at various stages of the titration of a weak acid, HA, with NaOH. (The Na+ ions and water molecules have been omitted for clarity.) 

Four diagrams: i) Two HA, four A- ii) Six A-, 2 OH- iii) Six HA iv) Six A-

To which of the following regions of the titration curve does each drawing correspond.

(iii)