Post-Lab Questions A white solid melts at 1000 . The melt conducts electricity.
ID: 548446 • Letter: P
Question
Post-Lab Questions A white solid melts at 1000 . The melt conducts electricity. Classify the substance as best as you can from these facts 2. A given substance is a white solid at 25°C. It melts at 150°C without decomposing, and the melt does not conduct an electric current. What would be the classification of the substance, based on this information? 3 From the electrical conductivity.'section, compare the extent of conductivity of the mixture contaimng equaetic acid and aqucous ammoniai and ammonia alone. Explain Compare the electrical conductivity of distilled water with that of tap and ocean water. Explain your observations. 4Explanation / Answer
1. Ionic solid
2. substance = Covalent solid
3.
The mixture containing aqueous ammonia and acetic acid will have higher electrical conductivity.
This is because aqueous ammonia will ionize and react to form ions of CH3COO- and NH4+. Since ions conduct electricity, hence they will have higher electrical conductivity.
In case of ammonia and acetic acid alone, both are very weakly ionized, and hence less number of ions in the solution. This lowers the electrical conductivity.
4.
Electrical conductivity of distilled water.
We know the conductance is possible due to movement of electrons and the ions in the solution.
If we have distilled water only it is only the solvent.
If there is no any ions dissolved in the water so its very difficult to conduct electricity.
Tap water contains different minerals and these can act as an electrolyte.
For example if tap water contains NaCl then there is a formation Na+ and Cl- ions which are responsible for conduction of the electricity.
So the distilled water has negligible conductance and tab water can conduct electricity.