If a small amount of base is dissolved in water, in which direction will the pH of the solution move?
Answer and explanation
Correct answer: Towards above 7
The pH scale describes hydrogen-ion activity: neutral water is approximately pH 7, acidic solutions are below 7, and basic solutions are above 7. Dissolving a base in water increases hydroxide-ion concentration and makes the solution alkaline. Thus its pH moves to a value above 7, so option C is correct. It does not move below 7 or remain exactly neutral; the actual value depends on the amount and strength of the base.
Frequently asked questions
What is the correct answer to this question?
Towards above 7
Why is this the correct answer?
The pH scale describes hydrogen-ion activity: neutral water is approximately pH 7, acidic solutions are below 7, and basic solutions are above 7. Dissolving a base in water increases hydroxide-ion concentration and makes the solution alkaline. Thus its pH moves to a value above 7, so option C is correct. It does not move below 7 or remain exactly neutral; the actual value depends on the amount and strength of the base.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Acids, Bases, and Salts.
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