Effect of Dissolved Co2 on the Ph of Water
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- Category: Science
- Date Submitted: 03/26/2014 03:15 AM
- Pages: 3
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Practical 3
Title: Effect of dissolved Carbon Dioxide on the pH of Water
Aim: To investigate the effect of dissolved carbon dioxide on the pH of water.
Hypothesis: The dissolved carbon dioxide will cause the water to turn acid, lowering the pH when carbon dioxide dissolves in water in which it forms carbonic acid (H2CO3).
Materials: Straws, distilled water, safety glasses, pH probe, computer, universal indicator, gloves, lab coats, measuring cylinder, data logger, printer, pH chart.
Substance of risk | Nature of risk | Safety Precaution |
Weak carbonic acid solution | Slightly corrosive and might make contact with the eyes. | -Wear gloves and safety glasses. |
Limewater (calcium hydroxide) | May be irritant to the skin and eyes | -Wear gloves, lab coat safety glasses.-Wipe away any spills followed by washing of the contacted area.-Wash hands after use. |
Classware | May cause cuts | -Check any items for hair-like cracks before use; if so discard the item.-Handle with care.-Place on the centre of the bench. |
Method:
Part A
1. Added 100mL of distilled water using a measuring cylinder into a 250mL beaker.
2. Placed the pH probe attached to data logger and computer, into a beaker of water and recorded the pH for 120 seconds (control exp).
3. In another beaker, added 100mL of distilled water using a measuring cylinder. Placed the probe attached to data logger and computer, into the beaker.
4. Using a straw blew continuously and gently into the water and recorded the pH for 120 seconds.
5. Repeated the experiment at least 5 times. Compared the results obtained and if similar results are obtained, the results can be said to be reliable.
6. To prove that exhaled air contained carbon dioxide blew into a beaker of limewater using a straw.
Part B
1. Filled a beaker with 100mL of water and added 3 drops of universal indicator into it.
2. Using a straw, carbon dioxide was exhaled into the water, noting the colour.
3. The...
Title: Effect of dissolved Carbon Dioxide on the pH of Water
Aim: To investigate the effect of dissolved carbon dioxide on the pH of water.
Hypothesis: The dissolved carbon dioxide will cause the water to turn acid, lowering the pH when carbon dioxide dissolves in water in which it forms carbonic acid (H2CO3).
Materials: Straws, distilled water, safety glasses, pH probe, computer, universal indicator, gloves, lab coats, measuring cylinder, data logger, printer, pH chart.
Substance of risk | Nature of risk | Safety Precaution |
Weak carbonic acid solution | Slightly corrosive and might make contact with the eyes. | -Wear gloves and safety glasses. |
Limewater (calcium hydroxide) | May be irritant to the skin and eyes | -Wear gloves, lab coat safety glasses.-Wipe away any spills followed by washing of the contacted area.-Wash hands after use. |
Classware | May cause cuts | -Check any items for hair-like cracks before use; if so discard the item.-Handle with care.-Place on the centre of the bench. |
Method:
Part A
1. Added 100mL of distilled water using a measuring cylinder into a 250mL beaker.
2. Placed the pH probe attached to data logger and computer, into a beaker of water and recorded the pH for 120 seconds (control exp).
3. In another beaker, added 100mL of distilled water using a measuring cylinder. Placed the probe attached to data logger and computer, into the beaker.
4. Using a straw blew continuously and gently into the water and recorded the pH for 120 seconds.
5. Repeated the experiment at least 5 times. Compared the results obtained and if similar results are obtained, the results can be said to be reliable.
6. To prove that exhaled air contained carbon dioxide blew into a beaker of limewater using a straw.
Part B
1. Filled a beaker with 100mL of water and added 3 drops of universal indicator into it.
2. Using a straw, carbon dioxide was exhaled into the water, noting the colour.
3. The...