Question

If the difference between ph and poh solution is 4 then ph is equal to

Answer 1

I think the answer should be 5

Answer 2

pH+poH=14
pH-poH=4
then pH=poH+4
pH+poH=14
poH+poH+4=14
2(poH)=14-4
poH=10/2=5
pH=5+4=9