What Indicators Are Best for Titration of HNO3 with NaCN and LiOH with HNO2?

[Fusilli_Jerry89]

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?

 

[Borek]

First, calculate pH of the salt which is present in the solution at equivalence point. Second, select correct pH indicator.