To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorus acid (H_(3)PO_(3)), the volume of 0.1 M aqueous KOH solution required is :

To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorus

1.	To neutralise completely 20 mL of 0.1 M aqueous solution of phosphorus acid (H_(3)PO_(3)), the volume of 0.1 M aqueous KOH solution required is :
Answer» 10 mL 20 mL 40 mL 60 mL Solution :`H_(3)PO_(3)+2KOH to K_(2)HPO_(3)+2H_(2)O` `(M_(1)V_(1))/(n_(1))=(M_(2)V_(2))/(n_(2))` `(0.1xx20)/(1)=(0.1xx V_(2))/(2)` `V_(2)= 40 mL`