Question

measurements show that the ph of a particular lake is 4.0. what is the hydroxide - ion concentration of the lake? check answer 10^(-7) m 10^(-4) m 10.0 m 10^(-10) m

Explanation:

Step1: Recall pH - pOH relationship

pH + pOH=14. Given pH = 4.0, we can find pOH.
pOH=14 - pH
pOH = 14 - 4.0=10.0

Step2: Recall pOH - [OH⁻] relationship

The formula for pOH is pOH = -log[OH⁻]. So, [OH⁻]=10⁻pOH.
Since pOH = 10.0, [OH⁻]=10⁻¹⁰ M

Answer:

10⁻¹⁰ M