Unit_II_Acid-Base_Solutions_Worksheet

Acid-Base Solutions 1) Open the Acid-Base Solutions Interactive Simulation found in the syllabus under the Unit II Lab Assignment. 2) Click on “Introduction,” and then in the “Solution” menu, click on “Water.” Observe the graphic of the beaker. The equation can be seen below the beaker. Record this chemical equation. Water - 2 H 2 O  H 3 O + + OH - Strong Acid – HA + H 2 O  A - + H 3 O + Weak Acid - HA + H 2 O  A - + H 3 O + Strong Base – MOH  M + + OH - Weak Base – B + H 2 O  BH + + OH - 3) From the “Tools” menu (lower right), select pH paper and dip it in each solution provided in the “Solution” menu, recording the color of the paper. From the corresponding key, record the pH. Water - orange, pH is 6. Strong Acid – red, pH is 2. Weak Acid – Dark orange, pH is 4. Strong Base – Dark Blue, pH is 12 Weak Base – Dark Green, pH is 10. 4) From the “Tools” menu (lower right), change to the pH meter and dip it in the solution. Record the pH for each solution provided in the “Solution” menu. Note: You might record a slightly different pH with the meter than with the pH paper. Water – pH 7 Strong Acid – pH 2 Weak Acid – pH 4.5 Strong Base – pH 12 Weak Base – pH 9.5 5) From the “Tools” menu (lower right), select the light bulb and dip the electrode probes in each solution provided in the “Solution” menu. Record the strength of conductivity based on if the light bulb glows (strong bulb = strong electrolyte, weak bulb = weak electrolyte, no glow = nonelectrolyte). Water – Weak Bulb light Strong Acid – Strong Bulb light Weak Acid – Medium Bulb light Strong Base – Strong Bulb light Weak Base – Medium Bulb light 6) Take a screenshot of each of your completed collections, and insert it into the table below. You can do this by selecting the three horizontal lines in the bottom right hand corner of the simulation screen and then selecting “Screenshot.” A screenshot will be downloaded to your browser which you can save to your computer.

Solutions View (screenshots) Equation Color of pH paper & pH from color key pH from Meter Strength of Conductivity (light bulb) Water EXAMPLE IN VIDEO 2 H 2 O  H 3 O + + OH - Yellow (6.0) 7.00 WEAK

Orange (4.0)

Strong base MOH  M + + OH - Dark Blue (12.0) 12.00 STRONG Weak base B + H 2 O  BH + + OH - Dark Green 9.50 MEDIUM