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Question

Which of the following is(are) correct for buffer solution?

A
Acidic buffer will be effective within in the pH range (pKa±1)
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B
Basic buffer will be effective within the pH range (pKwpKb±1).
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C
H3PO4+NaH2PO4 is not a buffer solution
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D
Buffers behave most effectively when the [Salt]/[Acid] ratio equal to 1
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Solution

The correct options are
A Basic buffer will be effective within the pH range (pKwpKb±1).
B Buffers behave most effectively when the [Salt]/[Acid] ratio equal to 1
D Acidic buffer will be effective within in the pH range (pKa±1)
pH=pKa+log[salt][acid]
So pH of acidic solution increases if more salt is added.

Buffers behave most effectively when the [Salt]/[Acid] ratio equal to 1 and will be effective within in the pH range (pKa±1)

For a basic buffer
pOH=pKb+log[salt][base]

and pH=14pOH

So basic buffer will be effective within the pH range (pKwpKb±1).

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