ELEMENTARY CHEMISTRY – Classic Science: Unit Six: Molecules in Solutions

Acid-Base Solutions

http://phet.colorado.edu/en/simulation/acid-base-solutions

Age Range: Advanced

How do strong and weak acids differ? Use lab tools on your computer to find out! Dip the paper or the probe into solution to measure the pH, or put in the electrodes to measure the conductivity. Then see how concentration and strength affect pH. Can a weak acid solution have the same pH as a strong acid solution?

 

pH Scale

http://phet.colorado.edu/en/simulation/ph-scale

Age Range: Advanced

Test the pH of things like coffee, spit, and soap to determine whether each is acidic, basic, or neutral. Visualize the relative number of hydroxide ions and hydronium ions in solution. Switch between logarithmic and linear scales. Investigate whether changing the volume or diluting with water affects the pH. Or you can design your own liquid!

 

Northland Videos

http://www.northland.cc.mn.us/biology/Biology1111/animations/dissolve.html

Age Range: All

This interactive video will help you understand how ionic compounds dissolve in solvent.

 

Why does salt melt ice?

http://antoine.frostburg.edu/chem/senese/101/solutions/faq/why-salt-melts-ice.shtml

Age Range: All

From the General Chemistry Online series, the animation found on this page helps to explain how salt speeds up the process of melting.

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