Which of the following solutions is a buffer?

check all that apply.
a. a solution made by mixing 100 ml of 0.100 m ch3cooh and 500 ml of 0.100 m naoh
b. a solution made by mixing 100 ml of 0.100 m ch3cook and 50 ml of 0.100 m kcl
c. a solution made by mixing 100 ml of 0.100 m ch3cooh and 50 ml of 0.100 m hcl
d. a solution made by mixing 100 ml of 0.100 m ch3cooh and 50 ml of 0.100 m naoh

D. a solution made by mixing 100 mL of 0.100 M CH3COOH and 50 mL of 0.100 M NaOH

Explanation:

Buffer solutions are the solutions which can resist the change in the pH up to some extent.

The pH of a buffer solution can be measured by the equation known as Henderson–Hasselbalch equation.

pH=pKa+log[base]/[acid]

Buffer solutions are the solutions of either weak acid and conjugate base of it or weak base and conjugate acid of it.

Hence, a weak acid and a strong base can result in weak acid and it's conjugate and can acts as a buffer.

Option D is correct.

since the atomic number is the number of protons in the nucleus, as we move to the left on the periodic table, the electrostatic pull between the nucleus and the valence electron shell decreases. as we move down a group (vertical column), the valence shell energy level gets further and further from the nucleus.