Ions or molecules causing reasons for the sample to be tested meter presence of

Question

Ions or molecules causing reasons for the sample to be tested meter presence of these reading conductivity or non- ions or molecules conductivity (be specific where possible) 1. Tap H20 (If no conductivity, notify instructor) 2. Distilled H20 (pure covalent) 3, 0.10M NaOH (strong base) 4. 0.10M NH4OH (may also be NH3.) (weak base) 5. 0.1M HC2H302 (weak acid) 6. Water solution of Sucrose (C12H22011) (covalent-neither acid nor base) 7. Solid NaCl (ionic) Put just enough in a dry beaker to cover the bottom of dry electrodes use for Part 8 8. NaCl(aq) (add water to the solid from above (tap or distilled?) 9. 0.10M HCI (strong acid) Exp. 5.5

Explanation / Answer

Conductivity

1. Tap water

Ions present : Na, K, Ca and Mg

Reason for the ions presence : Tap water has dissolved metals which form ions in solution

2. Distilled water

Ions present : None

Reason for the ions presence : N.A.

3. 0.1 M NaOH

Ions present : Na+, OH-

Reason for the ions presence : string base dissociates in solution

4. 0.1 M NH4OH

Ions present : NH4+, OH-, H+

Reason for the ions presence : NH4OH first dissociates and then weak acid NH4+ dissociates in solution

5. aqueous solution of sucrose

Ions present : None

Reason for the ions presence : N.A.

6. solid NaCl

Ions present : None

Reason for the ions presence : N.A.

7. NaCl (sq)

Ions present : Na+, Cl-

Reason for the ions presence : NaCl forms ions in solution

8. 0.1 M HCl

Ions present : H+, Cl-

Reason for the ions presence : Strong acids dissociates totally in solution

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