When carbon dioxide comes in contact with water and undergoes a chemical reaction ________ is produced
Answers
Answer:
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When carbon dioxide comes in contact with water and undergoes a chemical reaction_______ produce a slightly acid solution called carbonic acid_____is produced.
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Answer:
The reaction between carbon dioxide and water
When carbon dioxide reacts with water a weak acid is formed. Carbon dioxide is present in exhaled breath. Observing a colour change using an acid-base indicator shows the reaction between carbon dioxide and water.
Explanation:
The reaction between carbon dioxide and water
Class practical
When carbon dioxide reacts with water a weak acid is formed. Carbon dioxide present in exhaled air is blown into a flask containing an indicator sensitive to small changes of pH in the appropriate region of the pH scale, and the consequent colour changes observed and recorded. The equation for the reaction between carbon dioxide and water may be introduced for appropriate students.
Lesson organisation
This is a relatively brief and straightforward exploration of the reaction of carbon dioxide and water at a simple level, which should take no more than 15 minutes.
If students have not yet met the compositions of inhaled and exhaled air, this experiment can serve as part of the learning sequence for the topic of breathing and respiration in an introductory science course, using an appropriately elementary approach to the chemistry involved.
For students who have already covered the topic of breathing and respiration, and know that carbon dioxide is a significant component of exhaled air, the focus in this experiment can be transferred to the nature of the chemical reaction. (other related topics could be acid rain, gas liquid reactions or indicators)
Apparatus Chemicals
Each working group will require:
Eye protection
Conical flask (250 cm3), 2
Indicator bottles with dropping pipettes, 3
Ethanol (IDA – Industrial Denatured Alcohol) (HIGHLY FLAMMABLE, HARMFUL)
Thymolphthalein indicator solution (HIGHLY FLAMMABLE), access to small bottle with dropper
Phenol red indicator solution (HIGHLY FLAMMABLE), access to small bottle with dropper
Sodium hydroxide solution, 0.4 M (IRRITANT), small bottle with dropper
Distilled (or deionised) water (125 cm3), 2
Refer to Health & Safety and Technical notes section below for additional information.
Health & Safety and Technical notes
Read our standard health & safety guidance
Wear eye protection.
Phenol red indicator - see CLEAPSS Hazcard. The indicator may be purchased as a solid reagent or as a ready-made solution in ethanol. The solution may be made from the solid reagents by preparing a 5% w/v solution in ethanol (IDA). If 30 cm3 or 60 cm3 dropping bottles with integral dropping pipettes are available, these are ideal for dispensing the indicator solutions. While phenol red itself is not flammable, its solution in ethanol is highly flammable.
Thymolphthalein indicator - see CLEAPSS Hazcard. The indicator may be purchased as a solid reagent or as a ready-made solution in ethanol. The solution may be made from the solid reagents by preparing a 5% w/v solution in ethanol (IDA). If 30 cm3 or 60 cm3 dropping bottles with integral dropping pipettes are available, these are ideal for dispensing the indicator solutions. While thymolphthalein itself is not flammable, its solution in ethanol is highly flammable.
Ethanol (IDA – Industrial Denatured Alcohol), CH3CH2OH(l), (HIGHLY FLAMMABLE, HARMFUL) - see CLEAPSS Hazcard.
Sodium hydroxide solution, NaOH(aq), (IRRITANT at concentration used) - see CLEAPSS Hazcard and CLEAPSS Recipe Book.
Procedure
Activity 1
a. Place about 125 cm3 of water in a 250 cm3 conical flask.
b. Add five or six drops of thymolphthalein indicator to the water.
b. Add (two or three drops) just enough sodium hydroxide solution to produce a blue colour.
d. Talk or blow gently into the flask – ie add the carbon dioxide.
e. Continue adding the carbon dioxide until a colour change is observed.
Activity 2
a. Place about 125 cm3 of water in a 250 cm3 conical flask.
b. Add one or two drops of phenol red to the water.
c. Add two drops of sodium hydroxide solution to produce a red solution.
d. Talk or blow gently into the flask – ie add carbon dioxide.
e. Continue adding the carbon dioxide until a colour change is observed.