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Tell me whether the following mystery substances are acids or bases/alkaline: a. has pH of 2.5, litmus paper turned red b. has pH of 12.8, litmus paper turned blue


The substance in question has a pH value of 2.5 and causes litmus paper to turn red. Explanation: Based on the observation that the litmus paper turned red, it can be inferred that the substance is acidic in nature. The pH value of 2.5 further confirms its acidic properties, indicating a high concentration of hydrogen ions present in the solution.