Question

Which of the following aqueous solutions are good buffer systems? .

__0.10 M sodium hydroxide + 0.27 M sodium chloride.

__0.28 M ammonia + 0.34 M ammonium nitrate.

__0.25 M perchloric acid + 0.25 M sodium perchlorate.

__0.32 M sodium iodide + 0.23 M potassium iodide.

__0.15 M hydrocyanic acid + 0.16 M hydroiodic acid.

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Answer #1

acidic buffer is formed by weak acid and its conjugate base

basic buffer is formed by weak base and its conjugate acid

1)

NaOH is strong base and NaCl is neutral salt.

They will not form buffer.

2)

NH3 is weak base and NH4+ is its conjugate acid.

They will form basic buffer

3)

HClO4 is strong acid and NaClO4 is neutral salt.

They will not form buffer.

4)

NaI and KI are both neutral salt.

They will not form buffer.

5)

HCN and HI are both weak acid

They will not form buffer.

Answer:

False

True

False

False

False

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