A salt solution shows pH 6 and turns blue litmus slightly red. From what may this salt be formed?
Answer and explanation
Correct answer: Strong acid and weak base
A pH of 6 is below 7, and the slight red colour of blue litmus confirms that the salt solution is mildly acidic. In school-level salt hydrolysis, a salt formed from a strong acid and a weak base generally gives an acidic solution because the conjugate acid of the weak base hydrolyses in water. A strong base with a weak acid usually gives a basic solution, while strong acid plus strong base is approximately neutral. Hence option B is correct.
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What is the correct answer to this question?
Strong acid and weak base
Why is this the correct answer?
A pH of 6 is below 7, and the slight red colour of blue litmus confirms that the salt solution is mildly acidic. In school-level salt hydrolysis, a salt formed from a strong acid and a weak base generally gives an acidic solution because the conjugate acid of the weak base hydrolyses in water. A strong base with a weak acid usually gives a basic solution, while strong acid plus strong base is approximately neutral. Hence option B is correct.
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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