Review of Chem 30 Acid Base Equilibrium (Student Developed Review BLOCK 2)

Review of Chem 30 Acid Base Equilibrium (student developed review BLOCK 2)

1. Calculate the pH of 0.055H2SO4

2. If 5.0g of NaOH was dissolved in 250mL of water, what is the hydronium ion concentration, hydroxide ion concentration, pH and pOH of the solution?

3. Write the equilibrium law expression for the combustion of methanol. Calculate the equilibrium K value and determine the direction of the reaction favor if the concentration at equilibrium is 0.50M methanol, 0.80M oxygen and 0.30M carbon dioxide.

4. Determine the equilibrium expression and calculate the Kc value for the given equilibrium concentration if at equilibrium of the reaction of aluminum metal reacts with 4.0M silver nitrate to produce 3.0M aluminum nitrate and silver metal.

5. What direction would the equilibrium shift for each of the following changes to the reaction of sulfur dioxide gas reacting with oxygen gas to produce sulfur trioxide gas. Include a graph to show the effect of the change. a. increase in temperature b. oxygen gas is added c. decrease in volume d. catalyst added

6. What is Le Chatalier’s Principle? Given the following changes to the reaction of ammonia reacting with oxygen to produce water and nitrogen dioxide, explain the effect of each change and graph the resultant change. a. Increase of temperature b. Decrease of volume c. Increase ammonia d. Catalyst added

7. Determine the equation of NaHSO4 reacting with Chloride ions. Write the equilibrium law expression and label the acid, base, conj acid and conj base. Also, determine which entity may be considered amphiprotic.

8. Use the Bronsted Lowry theory and table of relative strengths of acids and bases to predict a net acid base neutralization equation for the following reactions. Label the acids, bases, conj acids and conj bases in each reaction and determine the equilibrium equation for each. a. Acetic acid reacts in water b. Reaction of sulfurous acid and ammonia c. Reaction of sodium bicarbonate with ammonium chloride

9. If 0.5M of hydrogen iodide is placed in a 0.75L reaction vessel, and the temperature is raised to 450C and maintained until equilibrium is established. At equilibrium the vessel contains 0.215M hydrogen gas and 0.215M iodine gas, what is the equilibrium value (K)? Does the reaction favor the reactants or the products?

10. What is the initial concentration of sodium cyanide with a pH of 11.284?

11. Explain what would happen if you have an acidic buffer system and you add NaOH to it. Include a equilibrium reaction and a graph to explain your answer.

12. Explain how your body keeps the blood pH at a constant 7.2 in the presence of excess CO2 during physical activity. Review of Chem 30 Acid Base Equilibrium (student developed review BLOCK 2)

13. What is the endpoint pH for the titration of acetic acid and sodium hydroxide? Use a graph to explain the answer and determine an appropriate indicator.

14. A titration includes titrating 20.0mL acetic acid with weak base CaOH2, using phenolphthalein to get a

light pink color. It was found that 29.83 mL of 0.2M CaOH2was required to neutralize acetic acid. Calculate the concentration of acetic acid and draw the titration graph.