If the pH of a popular soft drink is 6.5, then what is the pOH?

1.
If the pH of a popular soft drink is 6.5, then what is the pOH?

pOH = pKw - pH = 14.0 - 6.5 = 7.5

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2.
What is the final concentration when water is added to 0.50mL of a 12M NaOH solution to make 3.0L of a diluted NaOH sample?

For dilution: C₁V₁ = C₂V₂
Then, C₂ = C₁ × (V₁/V₂)

Final concentration, C₂ = 12 × [0.50 / (3.0 × 1000)] M = 0.002 M

pH + pOH = 14

pOH = 14 - 6.5 = 7.5

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Use M1V1 = M2V2

(12 mol/L) (0.00050 L) = (x) (3000 L)

x = 0.0000020 M