In our previous lesson, we discussed the behavior of sodium chloride (NaCl) when placed in water.
8
* What type of compound is sodium chloride?
* Based on this, what happens to the compound once it enters into solution with water?
Click here to see a video clip of what happens once sodium chloride enters into solution with water.
We know from previous lessons that NaCl is an ionic compound. As the video illustrated, NaCl breaks down into its respective ions, whereupon water is able to attach to each ion based on its polar properties (the negative side of water attaches to Na+ and the positive side of water attaches to Cl-).
NaCl + H2O ---> Na+ (aq) + Cl- (aq)
Hypothetical Scenario: Suppose once NaCl entered into solution with water, two electrodes (conductors of electricity such as copper wire) were placed into solution, connected to a battery, and attached to a voltmeter (a device that measures current).
9
The setup of this experiment would look similar to the picture shown above.
* Since NaCl was dissolved in water, what products are currently in the flask?
* Based on our discussion of the battery earlier, what moves from the anode to the cathode and is responsible for lighting the bulb?
* Do electrons have a charge associated with them? What kind?
If we were to insert a light bulb into our setup above, this is what we would see (refer to picture below)
10
* Based on this observation, what do we now know about NaCl, other than that it is an ionic compound?
Aqueous sodium chloride can conduct electricity! It turns out, any compound whose aqueous solutions conduct electricity are called electrolytes.
FeSO3
HCl
CuCl2
H2S
KCl
HC2H3O2
* What do the six compounds listed above all share in common?
* If we were to perform a similar procedure as described above with NaCl, do you think any of these would conduct electricity? Why or why not?
ALL IONIC SOLUTIONS CONDUCT ELECTRICITY, THUS THEY ARE CONSIDERED ELECTROLYTES!
იხ. ქვემოთ ქარტულად.
