1.

A substance decomposes in a solution following first order kinetics. Flask A contains 1L of 1M solution and flask B contains, 100 mL of 0.6 M solution. After 8 hours, the concentration of substance in flask A becomes 0.25 M. What will be time taken for the concentration of the same substance in flask B to become 0.3 M?

Answer»


Solution :In FLASK A, `k=2.303/8 log 1.0/0.25`
`=2.303/8 log 4=2.303/4 log 2`
In flask B,
`t=2.303/k log 0.6/0.3=2.303/k log 2`
`=(2.303 log 2) xx 4/(2.303 log 2)=4`


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