Purpose
To observe the properties of acids
Materials
- samples of acids metals,
- red and blue litmus paper,
- universal indicator,
- NaOH,
- and well plates
Procedure
Using the chart below test each acid against the metals, indicators, and base listed in the left hand column. Follow any additional directions indicated in boxes.
| HCl | H2SO4 | HC2H3O2 |
| Zn | Produces gas | Produces gas, stronger then HCl | Weaker reaction then others |
| Mg | Produces gas | Strong reaction, produces gas. The Mg dissolves | Produces gas, weaker reaction. Bubbling |
| Cu | No reaction | No reaction | No reaction |
| Red Litmus | red | red | Red |
| Blue Litmus | red | Red | red |
| Universal Indicator Record: color and pH range | Red pH=2 | Red pH=3 | Red ph=4 |
NaOH- NaOH + acid
- add 2 drops universal indicator
- Record Color and pH range
| pH becomes closer to seven. The color is purple | pH becomes closer to seven. The color is purple | pH becomes closer to seven. The color is purple |
Analysis
What type of reaction can occur between a metal and an acid?
Single replacement reactions.
List the combinations of metals and acids that reacted with each other. How could you tell there was a reaction?
Zinc and magnesium react with all of the acids. Cu did not react with any of the acids. I could tell there was a reaction because the substance bubbled and gave off gas.
Choose one of the reactions from #2 and write a balanced equation for it.
Mg + 2HClMgC2 + H2
What happened to the pH value when NaOH was added to each acid?
The pH increases to make the acid closer to neutrality.
Conclusion
Acids do not reacted well with copper, but do react well with metals such as magnesium or zinc. When a base is added to an acid, the acid is neutralized and becomes more basic.
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