1.

Predict titration curve for titration of Na(2)CO_(3) & HCl

Answer»

Solution :`Na_(2)CO_(3)+HClrarrNaHCO_(3)+NaCl`
`pH_(1)="Half equivalence point with respect to" 1^(st)` neutralisation =`pK_(a_(2))`(:.solution will be a buffer consisting of equal amount of `CO_(3)^(2-)&HCO_(3)^(-))`
`pH_(1^(st eqpt))=(pK_(a_(1))+pK_(a_(2)))/(2)( :."AMPHIPROTIC ANION")`
`NaHCO_(3)+NaClrarr H_(2)CO_(3)+NaCl`
`pH_(2)`=half equivalence point with respect to `2^(nd)`neutralisation =`pK_(a_(2))` ( :.solution will be a buffer)
consisting of equal amount of `HCO_(3)^(-)&H_(2)CO_(3))`
`pH_(2^(ndaqpt))=1//2(pK_(a_(1))-LOGC)(":.weak acid")`


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