10.R: Acid, Bases and pH (Report)
- Page ID
- 306788
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Part A: Color of Red Cabbage Indicator With pH Standards
| pH Standard | Color with Cabbage Indicator |
|---|---|
| 1 | |
| 2 | |
| 3 | |
| 4 | |
| 5 | |
| 6 |
| pH Standard | Color with Cabbage Indicator |
|---|---|
| 8 | |
| 9 | |
| 10 | |
| 11 | |
| 12 | |
| 13 |
| pH Standard | Color with Cabbage Indicator |
|---|---|
| 7 |
Parts B and C: pH of Everyday Chemicals
| Chemical | Color with indicator | Qualitative pH | Acidic, basic, or neutral? | Quantitative pH |
| Soda | ||||
| Shampoo | ||||
| Mouth wash | ||||
| Bleach | ||||
| Laundry detergent | ||||
| Lemon juice | ||||
| Vinegar | ||||
| Tap water | ||||
| 0.1 M HCl | ||||
| 0.1 M NaOH |
Part D: Effect of Buffers on pH
| Test Tube | Content | Initial pH | Chemical Added | New pH | pH Change |
|---|---|---|---|---|---|
| A | Water | HCL | |||
| B | Buffered solution (acetic acid and sodium acetate) | HCl | |||
| C | Water | NaOH | |||
| D | Buffered solution (acetic acid and sodium acetate) | NaOH |
Post-Lab Questions
- What is an acidic solution? What is a basic solution?
- What is an alkaline solution?
- What is a pH indicator? What are common uses of pH indicators?
- Write the mathematical equation that relates pH value and H+ ion concentration:
- Circle correct choice: Acids have (high OR low) pH, and (high OR low) H+ ion concentration. Bases have (high OR low) pH, and (high OR low) H+ ion concentration.
- When the H+ ion concentration is expressed in brackets [H+ ], what are the units of the for H+ ion concentration?
- Does a solution with pH 10 have equal, less or more H + ions than of a solution with a pH 6? Calculate the [H+ ] for both solutions, include units in your answer:
- For pH 10, [H + ] = _________________
- For pH 6, [H + ] = _________________
- The two methods of determining pH values (pH indicator versus pH meter) should show similar pH values for those solutions. What was different?