0.53 M means 0.53 mole in 1000 ml but he has transfered only 25 ml
So 25ml 0.53 M HF contains(0.53/1000)*25 = 0.01325mole HF
a) Number of mole of weak acid = 0.01325 mole
b) Since 0.01325 mole acid can be neutralise by 0.01325 mole base
Number of mole of base to neutralise = 0.01325 mole
c) 0.096M of NaOH means 0.096 mole in 1000ml
so for 1 mole we have to take 1000/0.096 ml
but we need 0.01325 mole , hence we have to take (1000/0.096) * 0.01325 = 138ml
d) 1/2 volume of 138 is 69 ml
in 69 ml there will be 0.01325/2 = 0.0066mole NaOH
at a section 4 questions will be answered , not more than that
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