Pairs of solutions

1.0 mol/L HNO₃(aq) and 1.0 mol/L LiOH(aq)

1.0 mol/L HBr(aq) and 1.0 mol/L LiBr(aq)

1.0 mol/L HNO₂(aq) and 0.10 mol/L LiNO₂(aq)

1.0 mol/L HCO₃^-(aq) and 1.0 mol/L CO₃^2-(aq)

 

If each of the pairs of solutions listed above is mixed together in equal volumes, then the pair of solutions that could act as a buffer is numbered

6 years ago

Answered By Jesse H

HNO₃ and HBr are both strong acids so they cannot make a buffer. The HNO₂ and LiNO₂ are not in equal concentrations so that leaves the hydrogen carbonate ion/carbonate ion mixed which is a weak acid and its conjugate base in equal concentrations so that's the buffer.

---