2. Complete the Teaching Idea “Concept Questions for Chemistry using PhET” posted by Trish Loeblein on the pH Scale simulation at PHET (http://phet.colorado.edu/en/simulation/ph-scale). On your blog post the answers with your scientific explanations from the “Clicker Questions pH Scale” posted by Trish.
3. Complete the Teaching Idea “Intro to Strong and Weak Acids and Bases” posted by Chris Bires on the Acid-Base Solutions simulation (http://phet.colorado.edu/en/simulation/acid-base-solutions) and post on your blog your data and answers to the questions posed.
Strong Acid | Weak Acid | Strong Base | Weak Base | Water | |
pH meter read (value) | 2.00 | 4.50 | 12.00 | 9.50 | 7.00 |
pH paper (color) | red | orange | Dark blue | Dark green | Light orange |
Conductivity (bright/dim/none) | bright | dim | bright | dim | Almost none |
Exists as Mostly (ions/molecules) | molecules | ions | ions | ions | molecules |
Strength | Initial Acid Concentration (mol/L) | [HA] (mol/L) | [A-] (mol/L) | [H+] (mol/L) | pH |
.010 M | negligable | 1.00x10^-2 | 1.00x10^-2 | 2.00 | |
.050 M | negligable | 4.59x10^-2 | 4.95x10^-2 | 1.31 | |
.100 M | negligable | 1.00x10^-1 | 1.00x10^-1 | 1.00 | |
1.00 M | negligable | 1.00x10^0 | 1.00x10^0 | 0.00 |
Strength (approximately) | Initial Acid Concentration (mol/L) | [HA] (mol/L) | [A-] (mol/L) | [H+] (mol/L) | pH |
.015 M | 1.50x10^-2 | 3.87x10-5 | 3.87x10^-5 | 4.41 | |
.150 M | 1.50X10^-1 | 1.22x10^-4 | 1.22x10^-4 | 3.91 | |
.015 M | 6.62x10^-4 | 1.43x10^2 | 1.43x10^2 | 1.84 | |
.150 M | negligable | 1.50x10^-1 | 1.50x10^-1 | 0.82 |
Strength | Initial Acid Concentration (mol/L) | [MOH] (mol/L) | [M+] (mol/L) | [OH-] (mol/L) | pH |
.010 M | negligable | 1.00x10^-2 | 1.00x10^-2 | 12.00 | |
.050 M | Negligible | 1.00x10^-2 | 1.00x10^-2 | 12.70 | |
.100 M | Negligible | 1.00x10^-1 | 1.00x10^-1 | 13.00 | |
1.00 M | Negligible | 1.00x10^0 | 1.00x10^0 | 14.00 |
Strength (approximately) | Initial Acid Concentration (mol/L) | [B] (mol/L) | [BH+] (mol/L) | [OH-] (mol/L) | pH |
.015 M | 1.49x10^-2 | 1.28x10^-4 | 1.28x10^-4 | 10.11 | |
.150 M | 1.50x10^-1 | 4.07x10^-4 | 4.07x10^-4 | 10.61 | |
.015 M | 1.79x10^-3 | 1.32x10^-2 | 1.32x10^-2 | 12.12 | |
.150 M | 6.84x10^-2 | 8.16x10^-2 | 8.16x10^-2 | 12.91 |
Conclusion Questions:
1. A strong acid is very concentrated / exists primarily as ions. (circle)
2. A weak base is a nonelectrolyte / weak electrolyte / strong electrolyte.
3. A strong base is a nonelectrolyte / weak electrolyte / strong electrolyte.
4. At the same concentration (Molarity) a strong acid will have a higher / lower / the same pH as a weak acid.
5. As concentration of a weak acid increases, the pH increases / decreases / remains constant.
6. As concentration of a weak base increases, the pH increases / decreases / remains constant.
7. As the concentration of a weak acid increases, the number of ions increases / decreases / remains constant.
8. As the concentration of a weak acid increases, conductivity increases / decreases / remains constant.
9. As the strength of a weak acid increases, the proportion of ions to molecules increases / decreases.
10. As the strength of a weak acid increases, the conductivity increases / decreases / remains constant.
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