Collecting a gas over water is a simple and effective way to collect a gas that is less dense than water. This method is often used to collect gases that are produced in a chemical reaction, such as hydrogen or oxygen.
To collect a gas over water, a gas collection apparatus is assembled and filled with water. The gas is then produced in a chemical reaction and bubbled through the water. The gas will collect in the upper part of the apparatus, displacing the water.
Collecting a Gas Over Water
Table of Contents
Collecting a gas over water is a simple and effective way to collect a gas that is less dense than water. This method is often used to collect gases that are produced in a chemical reaction, such as hydrogen or oxygen.
- Suitable for low solubility gases
- Easy to set up
- Inexpensive
- Quantitative collection
Collecting a gas over water is a versatile technique that can be used to collect a variety of gases. It is a simple and inexpensive method that is easy to set up and use.
Suitable for low solubility gases
When collecting a gas over water, it is important to choose a gas that has low solubility in water. This is because gases that are highly soluble in water will dissolve into the water instead of collecting in the upper part of the apparatus.
- Low solubility
The gas should have a low solubility in water. This means that it should not dissolve easily into the water.
- Examples
Examples of gases with low solubility in water include hydrogen, oxygen, and nitrogen.
- High solubility
Gases with high solubility in water, such as carbon dioxide and ammonia, are not suitable for collection over water.
- Quantitative collection
Collecting a gas over water is a quantitative method, which means that it can be used to determine the amount of gas that is produced in a chemical reaction.
By choosing a gas with low solubility in water, you can ensure that the gas will collect in the upper part of the apparatus and that you will be able to collect a quantitative sample of the gas.
Easy to set up
Collecting a gas over water is a simple and easy-to-set-up method. All that is required is a gas collection apparatus, which can be assembled from a few simple pieces of glassware.
- Assemble the apparatus
The gas collection apparatus consists of a flask, a delivery tube, and a gas collection tube. The flask is filled with water, and the delivery tube is inserted into the flask. The gas collection tube is then inverted and placed over the delivery tube.
- Produce the gas
The gas is produced in a chemical reaction and bubbled through the water. The gas will collect in the upper part of the gas collection tube, displacing the water.
- Collect the gas
Once the gas has been collected, it can be transferred to another container for storage or analysis.
- Versatile method
Collecting a gas over water is a versatile method that can be used to collect a variety of gases. It is a simple and inexpensive method that is easy to set up and use.
The ease of setup makes collecting a gas over water a popular method for collecting gases in the laboratory.
Inexpensive
Collecting a gas over water is an inexpensive method compared to other methods of gas collection. The only equipment required is a gas collection apparatus, which can be assembled from a few simple pieces of glassware. These pieces of glassware are relatively inexpensive and can be easily purchased from a scientific supply company.
In addition to the low cost of the equipment, collecting a gas over water does not require any special reagents or chemicals. This makes it a very cost-effective method for collecting gases.
The inexpensiveness of collecting a gas over water makes it a popular method for collecting gases in the laboratory. It is a simple, easy-to-use, and cost-effective method that can be used to collect a variety of gases.
Here is a breakdown of the costs associated with collecting a gas over water:
- Flask: $5-10
- Delivery tube: $2-5
- Gas collection tube: $5-10
The total cost of the apparatus is typically less than $20. This makes it a very affordable option for collecting gases.
Quantitative collection
Collecting a gas over water is a quantitative method, which means that it can be used to determine the amount of gas that is produced in a chemical reaction.
- Measure the volume of gas
The volume of gas that is collected can be measured using a graduated cylinder or a gas syringe. This allows you to determine the amount of gas that was produced in the chemical reaction.
- Calculate the moles of gas
Once you know the volume of gas, you can use the ideal gas law to calculate the number of moles of gas that was produced. This allows you to determine the amount of gas that was produced in terms of moles.
- Determine the limiting reactant
In a chemical reaction, the limiting reactant is the reactant that is completely consumed. By collecting the gas over water, you can determine which reactant is the limiting reactant. This information can be used to determine the stoichiometry of the reaction.
- Applications
Collecting a gas over water is a versatile method that can be used for a variety of applications, including:
- Determining the amount of gas that is produced in a chemical reaction
- Calculating the moles of gas that is produced
- Determining the limiting reactant in a chemical reaction
The quantitative nature of collecting a gas over water makes it a valuable tool for chemists.
FAQ
Here are some frequently asked questions about collecting a gas over water:
Question 1: What is the purpose of collecting a gas over water?
Answer: Collecting a gas over water is a simple and effective way to collect a gas that is less dense than water. This method is often used to collect gases that are produced in a chemical reaction, such as hydrogen or oxygen.
Question 2: What type of gases can be collected over water?
Answer: Gases that have low solubility in water can be collected over water. This includes gases such as hydrogen, oxygen, nitrogen, and carbon dioxide.
Question 3: What equipment is needed to collect a gas over water?
Answer: The equipment needed to collect a gas over water includes a gas collection apparatus, which can be assembled from a flask, a delivery tube, and a gas collection tube.
Question 4: How do I collect a gas over water?
Answer: To collect a gas over water, assemble the gas collection apparatus and fill the flask with water. Insert the delivery tube into the flask and invert the gas collection tube over the delivery tube. Produce the gas in a chemical reaction and bubble it through the water. The gas will collect in the upper part of the gas collection tube, displacing the water.
Question 5: How do I measure the volume of gas collected?
Answer: The volume of gas collected can be measured using a graduated cylinder or a gas syringe.
Question 6: How do I calculate the moles of gas collected?
Answer: Once you know the volume of gas collected, you can use the ideal gas law to calculate the number of moles of gas that was produced.
Question 7: What are some applications of collecting a gas over water?
Answer: Collecting a gas over water is a versatile method that can be used for a variety of applications, including determining the amount of gas that is produced in a chemical reaction, calculating the moles of gas that is produced, and determining the limiting reactant in a chemical reaction.
Closing Paragraph for FAQ
These are just a few of the frequently asked questions about collecting a gas over water. If you have any other questions, please consult a chemistry textbook or a qualified chemist.
Now that you know the basics of collecting a gas over water, here are a few tips to help you get started:
Tips
Here are a few tips to help you collect a gas over water:
- Use a gas collection apparatus that is the right size for the amount of gas you are expecting to collect. If the apparatus is too small, the gas may overflow and escape. If the apparatus is too large, it will take longer to collect the gas.
- Fill the flask with enough water to cover the delivery tube. This will help to prevent the gas from escaping around the delivery tube.
- Invert the gas collection tube over the delivery tube before you start producing the gas. This will help to prevent the gas from escaping before it is collected.
- Collect the gas slowly and steadily. If you collect the gas too quickly, it may bubble through the water and escape. If you collect the gas too slowly, it may take a long time to collect the desired amount of gas.
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By following these tips, you can collect a gas over water safely and efficiently.
Now that you know the basics of collecting a gas over water, you can use this method to collect gases for a variety of experiments and applications.
Conclusion
Collecting a gas over water is a simple and effective way to collect a gas that is less dense than water. This method is often used to collect gases that are produced in a chemical reaction, such as hydrogen or oxygen.
To collect a gas over water, a gas collection apparatus is assembled and filled with water. The gas is then produced in a chemical reaction and bubbled through the water. The gas will collect in the upper part of the apparatus, displacing the water.
Collecting a gas over water is a versatile technique that can be used to collect a variety of gases. It is a simple and inexpensive method that is easy to set up and use.
Here are the main points to remember about collecting a gas over water:
- It is a simple and effective method for collecting gases that are less dense than water.
- It is a versatile technique that can be used to collect a variety of gases.
- It is a simple and inexpensive method that is easy to set up and use.
Closing Message
Collecting a gas over water is a valuable technique for chemists. It is a simple, inexpensive, and versatile method that can be used to collect a variety of gases. By following the tips outlined in this article, you can collect a gas over water safely and efficiently.