NEET 2019 Chemistry question

Which will make basic buffer?

(1)50 mL of 0.1 M NaOH + 25 mL of 0.1 M
(2)100 mL of 0.1 M + 100 mL of 0.1 M NaOH
(3)100 mL of 0.1 M HCl + 200 mL of 0.1 M Correct
(4)100 mL of 0.1 M HCl + 100 mL of 0.1 M NaOH

Answer: (3)

Solution

A basic buffer is a mixture of a weak base and its salt with a strong acid, i.e. there must be a weak base () left over along with its conjugate acid (). (1) NaOH 5 mmol + 2.5 mmol gives 2.5 mmol sodium acetate and 2.5 mmol excess strong base NaOH: a

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Question ID VK-092451