Question

What is the  [OH^-] in the final solution prepared by mixing of 20.0 ml of 0.05 M HCl with 30.0 ml of 0.1 M Ba (OH)₂ (?)

(a)  0.4 M

(b)  0.05 M

(c)  0.12 M

(d)  0.1 M

Answer 1

Correct option (d)  0.1 M

Explanation:

Ba(OH)₂  + 2 HCl → BaCl₂ + 2H₂O

 2 mol HCl neutralize 1 mole Ba(OH)₂

:.  1 mol HCl neutralize 0.5 mole Ba(OH)₂