On adding 100ml of 0.4 gl-1 of naoh to 500 ml sol of a buffer changed its ph by 0.5 what is the buffer capacity of buffer mixture

Asked by SELVA | 31st May, 2019, 02:34: PM

Expert Answer:

Buffer capacity is defined as the  number of moles of acids or bases added in one litre of solution to change the pH by unity.
 
Buffer space capacity equals fraction numerator Moles space of space the space acid space or space base space added space to space 1 space litre space of space buffer over denominator Change space in space pH end fraction
space space space space space space space space space space space space space space space space space space space space space

space space space space space space space space space space space space space increment pH equals 0.5 space space space

space space space space space space space space space space straight M subscript 1 straight V subscript 1 equals straight M subscript 2 straight V subscript 2
space space space space space space space space space space fraction numerator 0.4 over denominator 400 end fraction cross times 100 equals 500 cross times straight M subscript 2
space space space space space space space space space space space straight M subscript 2 equals fraction numerator 0.4 cross times 100 over denominator 400 cross times 500 end fraction
space space space space space space space space space space space straight M subscript 2 space equals 1 space straight M

for space 1 space litre space moles equals 1 cross times 1 equals 1 mole

So comma space Buffer space capacity equals fraction numerator 1 over denominator 0.5 end fraction
space space space space space space space space space space space space space space space space space space space space space space space space space space space space space equals 2


space space space space space space

Answered by Ravi | 3rd Jun, 2019, 02:37: PM