Question

A drop of solution (volume `0.05 mL`) contains `3 xx 10^(-6) "mole" H^(o+)` ions. If the rate constant of disappearance of `H^(o+)` ions is `1 xx 10^(7) mol L^(-1) s^(-1)`, how long would it take for `H^(o+)` ions in the drop of disappear?

Answer 1

`"Concentrationof drop"=("mole")/("volume in mL")xx1000`
`=(3.10^(-6))/(0.05)xx1000 =0.06 "mol litre"^(-1)`
`"Rate of disappearance"=("conc.change")/("time")`
`1xx10^(7)=(0.06)/("time")`
`"Time"=6xx10^(-9)sec`