Homework Help: Chemistry

Posted by Esmeralda on Sunday, September 12, 2010 at 10:12pm.

I have a lab for chemistry that I have to turn in soon, and I have no idea what the major and minor species if any of each of the substances we tested. Can someone please help me answer which one is the major/minor species of each of the elements?
They are:

1. H2O(deionized)[NO CONDUCTIVITY, NO ELECTROLYTES]

2. H2O(tap)[MEDIUM CONDUCTIVITY, WEAK ELECTROLYTES]

3. NaCl(s)[NO CONDUCTIVITY, NO ELECTROLYTES]

4. NaCl(aq)[HIGH CONDUCTIVITY, STRONG ELECTROLYTES]

5. CaCO3(s) + H2O(l)[MEDIUM CONDUCTIVITY, WEAK ELECTROLYTES]

6. CH3CH2OH(L)[NO CONDUCTIVITY, NO ELECTROLYTES]

7. CH3CH2OH(AQ)[NO CONDUCTIVITY, NO ELECTROLYTES]

8. C12H22O11(AQ)[NO CONDUCTIVITY, NO ELECTROLYTES]

9. HC2H3O2 17M(L)[NO CONDUCTIVITY, NO ELECTROLYTES]

10. HC2H3O2(AQ)[MEDIUM CONDUCTIVITY, WEAK ELECTROLYTES]

11. HCL IN TOLUENE[NO CONDUCTIVITY, NO ELECTROLYTES]

12.HCL(AQ)[HIGH CONDUCTIVITY, STRONG ELECTROLYTE]

13. NaOH(AQ) [HIGH CONDUCTIVITY, STRONG ELECTROLYTE]

14. 1.0M NH3(AQ)[MEDIUM CONDUCTIVITY, WEAK ELECTROLYTE]

15. 15M NH3(AQ) [LOW CONDUCTIVITY, WEAK ELECTROLYTE]

Chemistry - DrBob222, Monday, September 13, 2010 at 12:15am
The idea here is that no conductance means the material is not ionized which means the major species is molecular and not ionic. For example, #1 the major material must be H2O (as opposed to H^+ and OH^-).
#5. CaCO3 is slightly soluble. The major component is CaCO3. The minor ones are Ca^+2 and CO3^-2.

#3. NaCl(s). There is no ionization in the solid state. The major component is NaCl.
#4. NaCl(aq). This ionizes to Na^+ and Cl^- and gives strong conductance. The major components are the ions.
You should use this information to answer the other questions posted.

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