A student has two solutions of a substance. Solution-1: 25M, 400mL, and Solution-2: 30M, 300 ml. What is the molarity of the final solutions if these two solutions are mixed?

The molarity of the final solutions if these two solutions are mixed is 27.14

Explanation:

Yo know:

Molarity being the number of moles of solute per liter of solution, expressed by:

You can determine the number of moles that are mixed from each solution as:

Number of moles= Molarity*Volume

So, being 1 L=1000 mL, for each solution you get:

When mixing both solutions, it is obtained that the volume is the sum of both solutions:

Total volume= volume solution-1 + volume solution-2

and the number of total moles will be the sum of the moles of solution-1 and solution-2:

Total moles= moles of solution-1 + moles of solution-2

So the molarity of the final solution is:

In this case, you have:

Replacing:

Solving:

Molarity= 27.14

The molarity of the final solutions if these two solutions are mixed is 27.14

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