Chemistry 153

I. Simulations

1. Go to https://phet.colorado.edu/en/simulation/legacy/sugar-and-salt-solutions. You can either run the (slow) web version or download the Java version. Click-and-drag the conductivity meter so that both electrodes are in the water, and click “Show values” in the “Concentration” window. Click and shake the salt shaker until its concentration is about 0.25 mol/L, and note the brightness of the lightbulb. Next, continue adding salt until its concentration is about 0.50 mol/L, and note how the lightbulb’s brightness changes. The higher the conductivity, the brighter the lightbulb.

► Answer in your notebook: Is salt an electrolyte or nonelectrolyte? How does concentration affect the conductivity?

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