5A Salts

Question 1

Define the hydrolysis of salts

Answer 1

Secondary reactions of anions or cations with water that may affect pH of the salt solution

Question 2

Which salts result in neutral solutions
- What is one exception

Answer 2

Salts containing alkali/alkaline earth metal ion and the conjugate base of a strong acid (like NaCl)
- Be2+ is an exception

Question 3

Which salts result in a basic solution (>7)

Answer 3

Salts derived from a strong base AND/OR a weak acid

Question 4

Which salts result in acidic solutions (<7)

Answer 4

Salts derived from a strong acid AND/OR a weak base. OR Salts with highly charged metal cations (+3) and the conjugate base of a strong acid

Question 5

If a salt is derived from a weak acid and weak base, how do you determine if it acidic or basic

Answer 5

Determined by the relative magnitudes of Ka and Kb in competing hydrolysis reactions

Question 6

What equation can help determine pH based on changing the temperature

Answer 6

PH=-log[Kw]^0.5