Which of the following solutions is a good buffer system?Which of the following solutions is a good buffer system?A solution that is 0.10 M Li OH and 0.10 MHNO3A solution that is 0.10 MHCN and 0.10 MLiCNA solution that is 0.10 MNaCl and 0.10 MHClA solution that is 0.10 M Li and 0.10 MHNO3A solution that is 0.10 MHCN and 0.10 M Li Cl

A solution that is 0.10 M HCN and 0.10 M LiCN.

Explanation:

A buffer solution is a solution of a weak acid and its conjugate base or a solution of a weak base and its conjugate acid, so the pH of the solution changes in a very little range when an acid or base is added to the solution.

Let's evaluate each statement:

(a) A solution that is 0.10 M LiOH and 0.10 M HNO₃

This is not a buffer solution since the HNO₃ is not the acid conjugate of the LiOH, and also, the LiOH is a strong base and the HNO₃ is a strong acid.

(b) A solution that is 0.10 M HCN and 0.10 M LiCN

This is a buffer solution, with the following reaction:

HCN + H₂O ⇄ CN⁻Li⁺ + H₃O⁺  

The acid HCN is a weak acid and the LiCN is its conjugate base. The fact that the concentrations are equal for both is appropriate for the buffer solution.

(c) A solution that is 0.10 M NaCl and 0.10 M HCl

This is not a buffer solution since the HCl is a strong acid. It dissociates in water to form Cl⁻ and H⁺.

(d) A solution that is 0.10 M Li and 0.10 M HNO₃

This is not a buffer solution since the HNO₃ is not the conjugate base of Li, the HNO₃ is a strong acid that dissociates in water to form H⁺ and NO₃⁻.

(e) A solution that is 0.10 M HCN and 0.10 M LiCl

This is not a buffer solution since the LiCl is not the conjugate base of the acid HCN.

Therefore, the correct option is: A solution that is 0.10 M HCN and 0.10 M LiCN.

I hope it helps you!  

the electronic configuration of an atom with eight electrons is 1s²2s²2p⁴. the orbital diagrams are shown in the figure.

as per the hunds rule:

1. electrons tend to avoid being in the same orbital as per as practicable.

2. electrons in different orbitals of the same energy will have their spin parallel.

this can be illustrated from the multiplicity of the orbitals of the atom. as there are four electrons in the p orbital and p orbital has 3 sub-shells. the electrons can be fed in different ways as shown in the figure but the correct orbital diagram will be as per the hunds rule.