Question

What is the ph of a 0.006 m koh solution? 1. 11.78 2. 7.00 3. 2.22 4. 8.88 5. 5.12?

Answer 1

The concentration of OH⁻ is first converted to pOH bu using followinf formula,

pOH = -log [OH⁻]
Putting value,
pOH = -log (0.006)

pOH = 2.221
As we know,
pH + pOH = 14
Solving for pH,
pH = 14 - pOH
Putting value of pOH,
pH = 14 - 2.221

pH = 11.779
Result:
Option-1 is the correct answer.