What is the pH of a neutral solution?

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Prepare for the WJEC GCSE Chemistry Exam with multiple choice questions and detailed explanations. Enhance your knowledge and boost your confidence. Get exam-ready today!

Multiple Choice

What is the pH of a neutral solution?

Explanation:
pH shows how acidic or basic a solution is by looking at the hydrogen ion concentration. A neutral solution has equal amounts of hydrogen and hydroxide ions. In water at room temperature, [H+] = [OH-] = 1×10^-7 mol/L. The pH is defined as pH = -log10[H+], so pH = -log10(1×10^-7) = 7. Therefore, a neutral solution has pH 7. Values below 7 are acidic, while values above 7 are alkaline. (Temperature can shift neutrality slightly, but 7 is the neutral value under standard conditions.)

pH shows how acidic or basic a solution is by looking at the hydrogen ion concentration. A neutral solution has equal amounts of hydrogen and hydroxide ions. In water at room temperature, [H+] = [OH-] = 1×10^-7 mol/L. The pH is defined as pH = -log10[H+], so pH = -log10(1×10^-7) = 7. Therefore, a neutral solution has pH 7. Values below 7 are acidic, while values above 7 are alkaline. (Temperature can shift neutrality slightly, but 7 is the neutral value under standard conditions.)

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