CHM 2046C Module 12 Name: _Sample Exam__

Part K: Chapter 18 Key Terms 5 points

1. ________________ – a material that is one color below a particular pH and another color above it; typically these materials are themselves weak acids or bases.

2. ___________________ – a measure of how much hydronium or hydroxide can be added to a buffer solution before the buffer can no longer control the pH.

3. ___________________ – a solution that resists a change in pH when hydroxide or hydronium ions are added.

4. ___________________ - The limiting of acid (or base) ionization caused by the addition of its conjugate base (or conjugate acid)

5. ___________________ – the point in a titration at which one reactant has been exactly consumed by the solution of the other reactant.

6. ___________________ – the equilibrium constant for the formation of a complex ion.

7. ___________________ – an equation that allows us to calculate the pH of a buffer:

[conjugate base]

pH = pK_a = log ------------------------

[acid]

8. ___________________ – the equilibrium constant for the dissociation of a sparingly soluble salt. For the salt A_xB_y, it has the form:

K_sp = [A ^y+]^x [B ^x-]^y

9. ___________________ – the substance added during a titration.

10. __________________ – the addition of a base to an acid (or vice versa) until the equivalence point is reached