Chemistry doubt

Asked by achamerahul2 | 14th Apr, 2020, 02:42: PM

Expert Answer:

Equilibrium concentration is given, To calculate pH, read the first statement - 'First dissociation to be 100% and second dissociation to be 50%', Which clearly means dissociation is reduced by half so degree of dissociation would be=0.5
left square bracket O H to the power of minus right square bracket equals C alpha
left square bracket O H to the power of minus right square bracket equals 8 cross times 10 to the power of negative 3 space end exponent cross times 0.5
space space space space space space space space space space equals 4 cross times 10 to the power of negative 3 end exponent space M
p O H equals negative log left parenthesis 4 cross times 10 to the power of negative 3 end exponent right parenthesis
p O H equals 2.4
p H equals 14 minus 2.4
p H equals 11.6

Answered by Ravi | 15th Apr, 2020, 09:06: PM