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Chemistry Indicators Problem

  • #1

Homework Statement


Select a suitable indicator for each of the following titrations:
HNO3 added to NaCN

LiOH added to HNO2

Homework Equations


all i know is Ka(HIn)=[H3O] at transition point and pKa(HIn)=pH at transition point



The Attempt at a Solution


the book I have is really skimpy on this, and is has no other information, or even an example.

For LiOH + HNO2 <----> H20 + LiNO2
ic that Li doesn't hydrolyze and NO2 does. the ka for NO2 is 5.1E-4 which should also be the Ka then I -log(5.1E-4) and I get the wrong answer????? The answer should be an indicator with a pH range around 8-10. I don't get it, can someone please help me?
 

Answers and Replies

  • #2
Borek
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