E4 Acid-Base chemistry & dyspepsia 3

Question 1

How do you calculate the pH of a strong acid, assuming the reaction goes to completion?

Answer 1

-log[H3O+]

Question 2

How do you calculate the pH of a strong base, assuming the reaction goes to completion?

Answer 2

use Kw= [H3O+][OH-] to find the conc of hydronium ion then use strong acid pH equation

Question 3

In aqueous solutions when should the ionisation equilibrium be considered?

Answer 3

if the concentration of acid or base becomes very low. If [acid] or [base] are less than 1x10^-6

Question 4

What is the equation for calculating the pH of a solution of a weak acid?

Answer 4

pH= 0.5pKa - 0.5log[HA]

Question 5

What is the equation for calculating the pH of a solution of a weak base?

Answer 5

pH= 0.5pKw + 0.5pKa + 0.5log[B]

Question 6

What is the Henderson-Hasselbalch equation for an acid?

Answer 6

pH= pKa + log[A-]/[HA}

Question 7

What is the Henderson-Hasselbalch equation for base?

Answer 7

pH= pKa + log[B]/[BH+]