Answer to Question #116444 in Chemistry for Areeb

Question

A solution has a [OH–] of 2.5 x 10–7M, what colour would it be if it was mixed with the indicator phenol red?

Answer 1

Solution:

[OH^–] = 2.5×10^–7 M

To calculate the pOH of a solution, use the equation:

pOH = −log[OH^–]

pOH = −log[2.5×10^–7] = 6.60

pOH = 6.60

pH + pOH = 14

pH = 14 − pOH = (14 − 6.60) = 7.4

pH = 7.4