TOPIC #6 Equilibria & Solubility (Use the Henderson- Hasselbach Equation)
1. 50.0 mL of 0.100 M HCl was added to a buffer consisting of 0.025 moles of sodium aceta
0.030 moles of acetic acid. What is the pH of the buffer after the addition of the acid? Ka of
acetic acid is 1.7 x 10". Answer
2.
Calculate the pH of a buffer solution that initially consists of 0.0400 moles of ammonia and
0.0250 moles of ammonium ion, after 20.0 mL of 0.75 M NaOH has been added to the buffer.
Ka for ammonium ion is 5.6 x 10 Answer

Ageochemist examines a piece of metal that he found in the soil. he performs tests to identify the metal from its density, electrical conductivity, and melting point. which statement best describes his investigation? a. he is determining physical properties that are sufficient to identify the metal.b. he is determining chemical properties that are sufficient to identify the metal.c. he is determining physical properties that are insufficient to identify the metal.d. he is determining chemical properties that are insufficient to identify the metal.