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Accetyl salicylic acid (aspirin) ionises...

Accetyl salicylic acid (aspirin) ionises in water as:

`(K_(a) = 2.75 xx 10^(-9))`
If two tablets of aspirin each of `0.32g` is dissolved in water to produce `250mL` solution, calculate

Text Solution

Verified by Experts

`[HC_(9)H_(7)O_(4)] = (0.32 xx 2xx 1000)/(180 xx 250) = 0.014M`
`because alpha = sqrt((K_(a))/(c)) = sqrt((2.75 xx 10^(-9))/(0.014)) = 4.43 xx 10^(-4)`
`:. [H^(o+)] = C .alpha = 0.014 xx 4.43 xx 10^(-4) = 6.21 xx 10^(-6)M`
`[C_(9)H_(7)O_(4)^(Theta)] = C.alpha = 6.21 xx 10^(-6)M`
`[OH^(Theta)] = (10^(-14))/([H^(o+)]) = (10^(-14))/(621.10^(-6)) = 1.61 xx 10^(-9)M`
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