Equal volumes of two solutions, one containing a strong acid at ph 2 and the other containing a strong base at ph 12, are mixed. once equilibrium is achieved, what is the final ph of the combined solution?

7  

Explanation:

Assume we have 1 L of each solution.

Solution 1

Solution 2

pH = 12

pOH = 14.00 - pOH = 14.00 - 12 = 2.0

3. pH after mixing

               H⁺  +  OH⁻ ⟶ H₂O

I/mol:     10⁻²    10⁻²  

C/mol:   -10⁻²   -10⁻²

E/mol:      0        0

The H⁺ and OH⁻ have neutralized each other. The pH will be that of pure water.

pH = 7

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