1.

An organic base X has K_(b) valusequalto 1xx10^(-9) . In what amounts should 0.01 M HCl and 0.01M solutionof X beprepare1 Lof a buffer solution havingpH = 7.0 ?

Answer»

Solution :`X + H_(2) O hArr XH^(+) + OH^(-)`
`K_(B)=([XH][OH^(-)])/([X]) = 1XX10^(-8)`
`pOH = pK_(b) + log ([XH^(+)])/([X])`
` rArr 7 = - log (10^(-8)) + log. ([XH^(+)])/([X])`
` rArr 7 = 8 + log. ([XH^(+)])/([X])`
`log.([XH^(-)])/([X]) = -1 `
` :.([XH^(+)])/ ([X])= 10^(-1)= 0.1 `


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