Chemistry, 22.04.2020 03:29, robbylynnbonner

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

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answered: mia2286

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.

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!

answered: Guest

Variables,control,conclusion and finally scientific theory

answered: Guest

question: ray weighs 100 kilograms, his wrestling partner, bobby, weighs 50 kilograms. if ray moves at 4 m s , how fast will bobby have to run at him to apply an equal amount of kinetic energy?

answer: 8 m/s he needs to run twice as fast to keep up so he has some work to do

explanation: if the mass has units of kilograms and the velocity of meters per second, the kinetic energy has units of kilograms-meters squared per second squared.

question answered by

(jacemorris04)

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Which of the following solutions is a good buffer system?Which of the following solutions is a good...