8, Click Stop when you have finished poinr that volume when the 9. Examine the d

Question

8, Click Stop when you have finished poinr that volume when the 9. Examine the data on the graph to find the graph to examine the data. As you conductivity value reaches a minimum Move across the are displayed. Record move the examine volume values of each data point table. the and value in your data the Haso, volume of the point with the conductivity trial 10. Print a copy of the graph and determine the equivalent for the second the 1. Rinse the Conductivity Probe with distilled water preparation trial. the results in 12. Repeat the necessary steps to conduct a second trial. Conduct table. DATA TABLE Trial 3 Trial 2 Equivalence point (mL) Molarity of Hiso (Mo PROCESSING THE DATA Part a 1. Based on your conductivity values, do the Group A compounds appear to be molecular, ionic, or weak acids? Would you expect them to partially dissociate, completely dissociate, or not dissociate at 2. Why do the Group A compounds, each with the same concentration (0.05 M), have such large differences in conductivity values? Hint: Write an equation for the dissociation of each. Explain. 3. In Group B, do all four compounds appear to be molecular, ionic, or weak acids? Classify each as a strong or weak electrolyte, and arrange them from the strongest to the weakest, based on conductivity values.

Explanation / Answer

1. Group A are all ionic salts. They all dissociate completely into ions.

2. With same concentration conductivity of solution of Group A are different as eaxch gives different nymber of ions in solution

NaCl --> Na+ + Cl- (2 ions)

MgCl2 --> Mg2+ + 2Cl- (3 ions)

AlCl3 --> Al3+ + 3Cl- (4 ions)

3. Group B are mix of strong and weak acids

HC2H3O2 weak electrolyte --> H+ + C2H3O2-

HCl is strong electrolyte --> H+ + Cl-

H3PO4 weak electrolyte --> H+ + H2PO4-

H3BO3 weak electrolyte --> H+ + H2BO3

4. Disscoiation of Group B is shown in 3.

5. H3BO3 and H3PO4 does not relate to number of ions formed in solutio as the electrolyte are not string as were in Grop A.

6. Group C are weak electrolytes H2O

H2O <=> H+ + OH-

molecular : C2H5OH, C2H5O2

7. Tap water has dissolved ions in it, which enhances its ionic conductivity as compared to distilled water with low conductivity value.

8. Ethylene glycol has slightly higher conductivity due to the two oxygens in the structure as compared to weaker ethanol.

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