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Ram can see the purple colour of an acid...

Ram can see the purple colour of an acidic indicator below `pH=5.5` only and the blue colour only above `pH=8.50` .How many times that of acidic form, must the concentration of the basic form at least be for Ram to see the end point of titration of `HCl` with `NaOH`?

Text Solution

Verified by Experts

`DeltapH=8.50-5.5=3`
`rArr (pK_("In")+(log)(["Basic"])/(["Acidic form"]))-(pK_("In")+(log)(["Basic"])/(["Acidic form"]))=3`
`rArr 2(log)(["Basic form"])/(["Acidic form"])=10xxlog2 rArr(log)(["Basic form"])/(["Acidic form"])=log 2^(5)`
`rArr ["Basic form"]=32["Acidic form"]`
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