To determine each of the following, what information from a titration curve would you use? Each answer choice can be used more than once or not at all. The appropriate indicator [ Choose ] The identity of the unknown [ Choose ] The concentration of the [ Choose ] unknown Whether the unknown is [ Choose ] strong or weak Whether to use a strong acid [Choose] or a strong base as the titrant

2 Using the data collected in Data Table, create a graph of “Drops of NaOH added” vs. “Average pH,” where “Drops of NaOH added” is on the x-axis and “Average pH” is on the y-axis. Label the points you used to measure the equivalence point and the pKa.

You are given a 0.25 M solution of an unknown weak base. Use 1/10th of dilution to find unknown weak base The diluted solution has a pH= 11.2. a) Write out an equation shows the reaction of base + waterb) What is the Ka and KB of weak base

For a certain diprotic acid, the pH at one half the volume to the first equivalence point is 4.15 and the pH at one half the volume between equivalence points is 7.22.  Given this information, what are the values for Ka1 and Ka2?

11. Calculate the concentrations of all species, pH and % ionization for each of the following. a) 0.20 M HC2H3O2 (Ka = 1.75×105) b) 1.5 M HNO₂ c) 0.10 M NH3 d) 0.25 M HN3 (Ka = 7.10×105) (Kb = 1.75×105) (Ka = 2.20×105)

Show equivalence point, 1/2 equivalence point, and pka on graph. Also, calculate the ka.

b) Determine the formula of the acid and the formula of the base to which each salt is related and put it them the appropriate columns in Table IV. using A= Acidic Salt, B = Basic Salt, and N = Neutral Salt. a) Copy your classification for each salt in Table III into Table IV. You can abbreviate in the "strength" (i.e. weak or strong) for each acid and base. NaOH + TABLE IV Parent Base Base Strength Salt Parent Acid Acid Strength Class. 0.1 M KC,H,CO, weak 0.1 M CH,NHNO, 0.1 M Sr(NO,)2 2. 0.1 M NaC,H,02 SB KA 0.1 M CH,CH,NH,CI 2. 0.1 M RBCIO 4 0.1 M NHI strong SB 0.1 M NaHCOO 0.1 M KBr strong SB 0.1 M K,S

Change the top option to a Base and repeat the table for 0.001, 0.01, 0.1 and 1 for the base filling in the table below. Acid Base Initial pH Initial pH Concentration Concentration 0.001M 3.00 0.001M 11.00 0.01M 2.00 0.01M 12.03 0.1M 1.00 0.1M 13.00 1M 0.00 1M 14.00 If you were to use a calculator to do these calculations would you get the same answers? Try at least one on the acid side and one on the base side to confirm your answer.

Classify the salts according to strength and role in buffer system. Classifications are as follows: Strong Acid/Conjugate Base, Strong Base/Conjugate Acid, Weak Acid/Conjugate Base, or Weak Base/Conjugate Acid. Example: HCI - Strong Acid/Conjugate Base 1. CaCO3 2. Li2SO3 3. Na₂S 4. Na3PO4 5. KC1 5000000 6. KCN 7. BaClz 8. NSHCO3 9. NACOOCH3 10. N₂HsBr 11. AgNO3 12. KHSO4 13. NaOCI wwwwww 14. NaNO3 15. NaH₂PO4

Which type of graph (log or linear) allows you to visually quantitate the differences in concentrations of the same species at two different pH values, especially when these concentrations are small? Explain with examples.