1.

Accetic acid and aq. NH_3are weak monobasic acid and weak monoacidic base respectivelyand K_a of aceticacid is equal to K_bof aq. NH_3 .Which of the following statement are correct?

Answer»

All proportions of the above mixing would result in an neutral solution having `pH =7 at 25^(@) C `
If aq. `NH_3` is exactlyhalf NEUTRALIZED by HCl, then pOH of resulting solution is equal to `pK_a`
If ACETIC acid is exactlyhalf neutralized by NaOH, then pH of resulting solutions is equal to `pK_a`
If acetic acid is exactlyneutralized by aq. `NH_3` then pH of resuling solution is equal `1//2` pkw

Solution :on completeneutralization `CH_3 COONH_4 ` isformedand pH ` =((7 +pKa - pKb)/( 2))= 7 (pKu)/(2)`
(b)At HALF neutralisation , buffer
` pOH=pKb + log ""(S)/(B)= pKb`
( c )At half neutralisationbuffer
` pH =pKa+ log ""(S)/(A)= pKa`


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