How much water should be added to 10.0 mL of 12.0 M HCl so that it has the same pH as 0.90 M acetic acid (K_a = 1.8*0 10^-⁵)? (Assume the volumes are additive.) A) 30 mL B) 3 L C) 30 L D) 300 L E) 300 mL

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Quizplus · Accepted Answer

To match the pH of 0.90 M acetic acid, the HCl solution must be diluted to the same hydrogen ion concentration. The pH of 0.90 M acetic acid is approximately 2.52. To achieve this pH with HCl, the concentration must be reduced to about 0.003 M, requiring a dilution factor of 4000, thus needing approximately 30 L of water.

How Much Water Should Be Added to 10