Question

Assume that acid rain has lowered the ph of a particular lake to ph 5.0. what is the hydroxide ion concentration of this lake?

Answer 1

That acid rain has lowered the ph of a particular lake to ph 5.0. the hydroxide ion concentration of this lake is

1 × 10^-9 mol of hydroxide ions per liter of lake water

 pH  +  pOH  =  14

 pOH  =  14  - 5

 pOH  =  9.00

 pOH  =  -log [OH⁻]

[OH⁻]  =  10^-pOH

[OH⁻]  = $10^{-9}$ mol

Therefore,

the hydroxide ion concentration of this lake is 1 × 10^-9 mol

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