The concentration of a potassium iodide solution can be determined by first adding excess silver nitrate: i'(aq) + ag+ (aq) → agl(s) the excess silver ion remaining in solution is then determined by reaction with a potassium thiocyanate (kscn) solution of known concentration: ag (aq) + scn(aq) → agscn(s) in an experiment, 50.00 ml of 0.0565 m agno3 was added to 25.00 ml of a potassium iodide solution. it then took 8.32 ml of 0.0510 m kscn solution to precipitate the unreacted silver ions. what is the concentration of the original ki solution?

0.096 M

Explanation:

Given:

50.00 ml of 0.0565 M AgNO₃ was added to 25.00 ml of a potassium iodide solution

8.32 ml of 0.0510 M KSCN solution to precipitate the unreacted silver ions

Now,

The moles of AgNO₃ added = Volume of solution × Concentration

or

The moles of AgNO₃ added = 0.05 × 0.0565 = 0.002825 moles

and

The number of moles of KSCN reacted

= Volume  × Concentration

= 0.00832 × 0.0510

= 0.00042432 moles

Now,

The number of moles of AgNO₃ that reacted with KI

= The moles of AgNO₃ added - The number of moles of KSCN reacted

= 0.002825 - 0.00042432

= 0.00240068

Therefore,

The concentration of the original KI solution =

or

The concentration of the original KI solution =  

or

The concentration of the original KI solution = 0.096 M

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