Question

Which of the following aqueous solutions are good buffer systems? 

• 0.12 M calcium hydroxide + 0.22 M calcium chloride 

• 0.21 M hydroiodic acid + 0.25 M sodium iodide 

• 0.19 M nitrous acid + 0.14 M potassium nitrite 

• 0.37 M hypochlorous acid + 0.27 M potassium hypochlorite 

• 0.34 Mammonium nitrate + 0.33 Mammonia

Answer 1

Buffer systems are those that are formed by a weak acid / base and its conjugate pair:

i) 0.19 M Nitrous acid - 0.14 Potassium nitrite

ii) 0.37 M Hypochlorous acid - 0.27 Sodium hypochlorite

iii) 0.34 M Ammonium nitrate - 0.33 M ammonia.

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