Weak acids and bases Flashcards
The smaller the Ka or Kb, the … the acid or base
Weaker
Completely dissociated
Strong acid
The larger the pKa or pkb, the … the acid or base
Weaker
The larger Ka, the further to the … the reaction goes
Right
The stronger the acid, the … its conjugate base
Weaker
Conjugate base of a strong acid is always…
Weak
Ones that only partially donate (accept) protons, forming equilibrium mixtures
Weak acids and bases
Kb =
Basicity constant
Ka =
Acidity constant
A … value of Ka/Kb indicates a … degree of dissociation and so a … weak acid/base
a large value of Ka/Kb indicates a large degree of dissociation and so a stronger weak acid/base
The … the pKa, the … the degree of dissociation and the … the weak acid
The smaller the pKa, the stronger the degree of dissociation and the stronger the weak acid
The strength of a weak acid is related to…
That pf its conjugate base
Which assumption for calculating the pH of the solution of a weak acid is normally appropriate?
That all the H3O+ in the solution comes from the dissociation of the weak acid (and not the water from the autoprolysis reaction)
What must be considered when calculating the pH of the solution of a weak acid if the initial concentration of the acid is very low?
Both sources of H3O+
