Question

Which pair/pairs form(s) buffer solution/s?

Explain your choice based on definition of buffer solution. Specify if buffer solution is found to be basic or acidic

sodium chloride and hydrochloric acid

hydrochloric acid and sodium hydroxide

carbonic acid and bicarbonate ion

acetic acid and bicarbonate ion 

acetic acid and carbonate ion 

ammonia and ammonium chloride

monopotassium phosphate and dipotassium phosphate

sulfuric acid and sodium disulphate 

ethylamine and ethyl ammonium chloride

Answer 1

Buffer solutions are solutions made up by mixing a weak acid with its conjugate base or vice-versa.

Thus,

sodium chloride and hydrochloric acid = non buffer ( as NaCl is a base made up of a strong base NaOH and strong acid HCl)

hydrochloric acid and sodium hydroxide = non buffer (HCl is a strong acid and NaOH is a strong abse)

carbonic acid and bicarbonate ion = acidic buffer

acetic acid and bicarbonate ion = non-buffer

acetic acid and carbonate ion = non-buffer

ammonia and ammonium chloride = basic buffer

monopotassium phosphate and dipotassium phosphate = non-buffer

sulfuric acid and sodium disulphate = non-buffer

ethylamine and ethyl ammonium chloride = basic buffer