A solution with a pH of 3 is:

Question

BlackTom AI · Accepted Answer

pH is defined as the negative base-10 logarithm of the hydrogen ion concentration: pH = −log10[H+]. This is the fundamental concept needed to classify a solution as acidic, neutral, or basic. 1. Relevant knowledge points and concepts - pH scale: numeric scale typically from 0 to 14 used to express acidity/basicity. - pH = 7 corresponds to neutral water at 25 °C ([H+] = 1.0 × 10−7 M). - pH < 7 indicates an acidic solution ([H+] > 1.0 × 10−7 M). - pH > 7 indicates a basic (alkaline) solution ([H+] < 1.0 × 10−7 M). - Buffered solutions resist pH change but can be acidic, neutral, or basic. 2. Step-by-step reasoning Start from the pH value given: pH = 3. Use the pH definition to find hydrogen ion concentration and compare with neutral value. 3. Calculations and intermediate steps pH = −log10[H+] 3 = −log10[H+] log10[H+] = −3 [H+] = 10^(−3) M = 0.001 M Compare to neutral: [H+]neutral = 10^(−7) M. Since 10^(−3) M (0.001 M) is much greater than 10^(−7) M, the solution has a higher hydrogen ion concentration than neutral water and is therefore acidic. 4. Why the correct answer is correct Because pH 3 corresponds to [H+] = 10^−3 M, which is greater than the neutral [H+] of 10^−7 M, the solution donates more H+ ions and is acidic by definition of the pH scale. 5. Why the other options are incorrect - Neutral: would require pH ≈ 7, not pH 3. - Basic: requires pH > 7 (lower [H+]), opposite of pH 3. - Buffered only: “buffered” describes resistance to pH change, not a pH value; a buffered solution can be acidic, neutral, or basic. Being buffered does not imply pH 3. 6. Conclusion Because pH 3 corresponds to a hydrogen ion concentration (10^−3 M) much higher than neutral (10^−7 M), the correct classification is Acidic, matching the provided answer.

A solution with a pH of 3 is:Single choice

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