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OpenStudy (anonymous):

A scientist observes that after mixing a solid powder into water, the pH of the newly formed solution is 2.7. What can he infer from this observation? The solution contains an indicator that has a pH of 2.7. The solid powder contained hydrogen ions. The pH indicator was used incorrectly. The powder increased the hydrogen ion concentration of the solution.

OpenStudy (anonymous):

the powder increased the hydrogen ion concentration of the solution

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