Question

How to identify if its a buffer
1 100ml 1M HCl and 100ml 0.5M NaCl
2 500ml 1 M HCl and 200ml 0.2M NH4OH
3 200 ml 1M H2so4 and 200ml 2M Hcl
4 10 ml 0.1 M H3Po3 and 5ml 0.1 M KOH

Answer 1

A buffer solution (more precisely, pH buffer or hydrogen ion buffer) is an aqueous solution consisting of a mixture of a weak acid and its conjugate base, or vice versa. Its pH changes very little when a small amount of strong acid or base is added to it.

so in example number 2 we can easily find out that in solution only hcl and nh4cl will be remain that's why it's a buffer solution..

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