Q. The pH of a buffer solution is 4.745. When 0.044 mole of B a ( O H ) 2 is added to I lit. of the buffer, the pH changes to 4.756. Then what is the buffer capacity?

for Ba(oh)2 means 0.44*2=0.088 because there are 2{oh}-
buffer capacity=no.of moles of solute / change in ph
change in ph =4.756-4.745=0.011
buffer capacity=0.088/0.011=8
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