Say you have 2.50 M CaSO, solution and you need 300. mL of 0.400 M CaSO, How can you prepare this dilution? * Take 32 mL of a 2.50 M solution and pour into a flask. Add water until total volume equals 200 ml. Take 48 mL of a 2.50 M solution and pour into a flask. Add water until total volume equals 300 ml.

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### How to Prepare Dilutions

#### Problem:
Say you have a 2.50 M \( \text{CaSO}_4 \) solution and you need 300. mL of 0.400 M \( \text{CaSO}_4 \). How can you prepare this dilution?

#### Instructions:
Choose the correct method from the following options:

1. **Option 1:**
   - Take 32 mL of a 2.50 M solution and pour into a flask.
   - Add water until total volume equals 200 mL.

2. **Option 2:**
   - Take 48 mL of a 2.50 M solution and pour into a flask.
   - Add water until total volume equals 300 mL.

3. **Option 3:**
   - Take 1875 mL of a 2.50 M solution and pour into a flask.
   - Add water until total volume equals 300 mL.

4. **Option 4:**
   - Take 120 mL of a 2.50 M solution and pour into a flask.
   - Add water until total volume equals 300 mL.

##### Explanation:
The correct answer will involve using the dilution formula \(C_1V_1 = C_2V_2\) where:
- \(C_1\) is the concentration of the stock solution.
- \(V_1\) is the volume of the stock solution needed.
- \(C_2\) is the concentration of the final solution.
- \(V_2\) is the volume of the final solution.

This formula is used to determine the relationship between the concentrations and volumes before and after the dilution.
Transcribed Image Text:### How to Prepare Dilutions #### Problem: Say you have a 2.50 M \( \text{CaSO}_4 \) solution and you need 300. mL of 0.400 M \( \text{CaSO}_4 \). How can you prepare this dilution? #### Instructions: Choose the correct method from the following options: 1. **Option 1:** - Take 32 mL of a 2.50 M solution and pour into a flask. - Add water until total volume equals 200 mL. 2. **Option 2:** - Take 48 mL of a 2.50 M solution and pour into a flask. - Add water until total volume equals 300 mL. 3. **Option 3:** - Take 1875 mL of a 2.50 M solution and pour into a flask. - Add water until total volume equals 300 mL. 4. **Option 4:** - Take 120 mL of a 2.50 M solution and pour into a flask. - Add water until total volume equals 300 mL. ##### Explanation: The correct answer will involve using the dilution formula \(C_1V_1 = C_2V_2\) where: - \(C_1\) is the concentration of the stock solution. - \(V_1\) is the volume of the stock solution needed. - \(C_2\) is the concentration of the final solution. - \(V_2\) is the volume of the final solution. This formula is used to determine the relationship between the concentrations and volumes before and after the dilution.
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