Which of the following aqueous solutions are good buffer systems?

Which of the following aqueous solutions are good buffer systems?

0.35 M barium bromide + 0.21 M sodium bromide
0.21 M hydrobromic acid + 0.21 M sodium bromide
0.20 M calcium hydroxide + 0.27 M calcium chloride
0.18 M hydrocyanic acid + 0.22 M potassium cyanide
0.29 M ammonia + 0.36 M barium hydroxide

Solutions

Expert Solution

acidic buffer is formed by weak acid and its conjugate base

basic buffer is formed by weak base and its conjugate acid

Option 1:

BaBr2 is salt and NaBr is slat.

They will not form buffer.

Option 2:

HBr is strong acid

NaBr is its salt.

They will not form buffer.

Option 3:

Ca(OH)2 is string base.

CaCl2 is its salt.

They will not form buffer.

Option 4:

HCN is weak acid.

KCN is its conjugate base.

They will form buffer

Option 5:

NH3 and Ba(OH)2 are both base

They will not form buffer.

Answer: option 4

queen_honey_blossom answered 1 year ago

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