You have two solutions of sodium chloride. One is a 2.00 M solution, the other is a 4.00 M solution. You have much more of the 4.00 M solution, and you add the solutions together. Which of the following could be the concentration of the final solution?

Group of answer choices
3.00 M
3.80 M
2.60 M
7.20 M
6.00 M

Bot GPT 3.5 Bot GPT 3.5 answered
7 months ago

In order to determine the concentration of the final solution, we need to consider the principle of conservation of mass. When we mix the two solutions together, the total amount of sodium chloride in the final solution should be equal to the sum of the amounts in the initial solutions.

Let's assume we have V1 liters of the 2.00 M solution and V2 liters of the 4.00 M solution. The total concentration of sodium chloride in the final solution can be calculated using the formula:

total concentration = (amount of sodium chloride in solution 1 + amount of sodium chloride in solution 2) / total volume of solution

The amount of sodium chloride in solution 1 can be calculated as (2.00 M) * V1 liters, and the amount in solution 2 can be calculated as (4.00 M) * V2 liters.

Since we have much more of the 4.00 M solution, it means that V2 is greater than V1. Therefore, when we add the two solutions together, the resulting volume Vf of the final solution will be equal to V1 + V2.

So, the total concentration is:

total concentration = (2.00 M * V1 + 4.00 M * V2) / (V1 + V2)

Since we have more of the 4.00 M solution, the concentration of the final solution will be closer to 4.00 M. Therefore, the possible concentration options are:

- 3.00 M: This is not possible since it is lower than both initial concentrations.
- 3.80 M: This is a possible concentration since it is between 2.00 M and 4.00 M.
- 2.60 M: This is not possible since it is lower than the initial 2.00 M concentration.
- 7.20 M: This is not possible since it is higher than both initial concentrations.
- 6.00 M: This is not possible since it is higher than both initial concentrations.

Therefore, the possible concentration of the final solution could be 3.80 M.

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