Question

Please give the answer with complete method

Answer 1

Hope this helps

pOH = -log(OH- ions)
=>pOH = -log(2 × 5 × 10^-6)
This is because after dissociation of Ba(OH)2, we'll get 2 times the concentration of Ba(OH)2 in OH- ions. Therefore,
=>pOH = 5

Now, pOH + pH = 14 (look it up), therefore

pH = 14 - 5, ie, 9, thus,

pH = 9

Peace.