Why does co2 dissolve in water

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Now live: A fully responsive profile. Related 1. Hot Network Questions. Question feed. Chemistry Stack Exchange works best with JavaScript enabled. Accept all cookies Customize settings. Ask students: Would you expect carbon dioxide to stay dissolved better in hot or cold water? Hint: Soda pop is kept in the refrigerator after it is opened. Students will discover the answer to this question as they do the following activity.

How could you set up an experiment to find out whether carbon dioxide stays dissolved better in water that is warmed or water that is cooled? Students should realize that they will need two cups of carbonated water. They will then need to heat one and cool the other. One simple way to heat and cool the cups is to use a hot or cold water bath like the one described in the procedure. If more carbon dioxide gas escapes from the soda, will there be more or fewer bubbles popping at the surface?

There will be more bubbles popping at the surface. If more carbon dioxide gas stays dissolved, will there be more or fewer bubbles popping at the surface? There will be fewer bubbles popping at the surface. Have students warm and cool 2 cups of carbonated water to find out if temperature affects the solubility of carbon dioxide. Question to Investigate Does carbon dioxide stay dissolved better in water that is warmed or water that is cooled? Place each of the cups of carbonated water into the cold and hot water, as shown.

Watch the surface of the soda in each cup of carbonated water. Expected Results More bubbles form and rise to the surface in the carbonated water that is placed in hot water. Discuss student observations. Ask students: Does carbon dioxide stay dissolved better in hot water or in cold water? Carbon dioxide stays dissolve better in cold water. How do you know? More gas escapes from the soda placed in hot water. Based on what you observed in this experiment, why do you think people store soda pop that has been opened in the refrigerator?

Since less carbon dioxide escapes when soda is colder, keeping soda in the refrigerator prevents the soda from going flat. Explain Explain why carbon dioxide gas escapes from hot water faster than it does from cold water. Help students relate their observations to the graph of the solubility of carbon dioxide in water. Ask students: As the temperature increases, is carbon dioxide more soluble in water or less soluble in water?

Carbon dioxide is less soluble as the temperature of the water increases. Does this graph match or not match your observations?

This graph matches student observations in the activity. As the carbonated water was warmed, more CO 2 left the solution. Since more gas left, less was dissolved in the warmer water. What do the graphs tell you about the solubility of carbon dioxide compared to sucrose, as temperature increases? The curve showing the solubility of carbon dioxide goes down as the temperature of the water increases, while the curve showing the solubility of sucrose goes up as the temperature of the water increases.

More sucrose can dissolve in hot water than in cold. But for carbon dioxide, more can dissolve in cold water than in hot. Ask students: During a long hot summer, you may notice fish gulping air at the surface of a pond. Why do you think the fish come to the surface like this, instead of breathing dissolved oxygen in the water the way they normally do? Like carbon dioxide, the concentration of dissolved oxygen is also affected by temperature. Cold water can hold more dissolved oxygen than warm water.

In winter and early spring, when the water temperature is low, the dissolved oxygen concentration is high. In summer and early fall, when the water temperature is high, the dissolved-oxygen concentration is lower. Coal-burning power plants heat water to turn turbines to make electricity. After using the water, it is cooled and then returned to the river or lake it came from.

Why is it important to cool the water before returning it to the river? Dissolved gases, like oxygen for fish and carbon dioxide for aquatic plants, would escape if the returned water were hot. Cool water helps keep gases dissolved, which fish, other aquatic creatures, and underwater plants need. Have students observe and explain what happens when Mentos candies are dropped in a bottle of Diet Coke.

Ask students: Has anyone ever seen the Diet Coke and Mentos demonstration? If students have seen it, ask them to describe the activity.