Reactions of acids and metal oxides

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9th

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6 Terms

1
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Apparatus

  • Kettle

  • 250cm3 beaker

  • 100cm3 beaker

  • 25cm3 measuring cylinder

  • Spatula

  • Glass rod

  • Heatproof mat

  • Universal indicator paper

  • Sulfuric acid

  • Copper(II) oxide on watch glass

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Method

  1. Add drop of sulfuric acid onto piece of universal indicator paper, strong acid

  2. Use measuring cylinder, to place 25cm3 of sulfuric acid into small beaker

  3. Fill large beaker about 1/3 full with hot water from kettle

  4. Warm sulfuric acid beaker by letting it rest in hot water bath (2 minutes)

  5. Carefully remove small beaker and add spatula of copper(II) oxide slowly and stir with glass rod

  6. Keep adding copper(II) oxide, until some left at bottom of beaker

  7. Let it sit for 2 minutes to allow black powder to settle

  8. Use glass rod to add drop of solution from to universal indicator paper, now slightly acidic

<ol><li><p>Add drop of sulfuric acid onto piece of universal indicator paper, strong acid</p></li><li><p>Use measuring cylinder, to place 25cm<sup>3</sup> of sulfuric acid into small beaker</p></li><li><p>Fill large beaker about 1/3 full with hot water from kettle</p></li><li><p>Warm sulfuric acid beaker by letting it rest in hot water bath (2 minutes)</p></li><li><p>Carefully remove small beaker and add spatula of copper(II) oxide slowly and stir with glass rod</p></li><li><p>Keep adding copper(II) oxide, until some left at bottom of beaker</p></li><li><p>Let it sit for 2 minutes to allow black powder to settle</p></li><li><p>Use glass rod to add drop of solution from to universal indicator paper, now slightly acidic</p></li></ol><p></p>
3
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Observations

  • At start of reaction pH of acid was 1-2

  • At end of reaction pH of solution was close to neutral

  • Blue solution produced (salt solution)

  • Heat produced (exothermic)

  • Most of black solid disappears

4
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Equation

acid + metal oxide → salt + water

5
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Error

adding too much acid

6
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Safety

  • Sulfuric acid is corrosive

  • Wear safety goggles and gloves

  • Handle with care to avoid splashes