Calculating Solution Concentration: Molarity and Volume

What are the steps to calculate the molarity of a solution?

How to determine the number of moles of a substance in a given solution?

How to find the volume of a solution needed to obtain a specific number of moles?

Answer:

Part A: The molarity of a solution is calculated by dividing the amount of solute (in moles) by the volume of the solution (in liters).

Part B: The number of moles in a solution can be computed using molarity and volume.

Part C: The volume of the solution needed to obtain a specific number of moles can be calculated using molarity.

In Part A, the molarity of a solution can be determined by dividing the amount of solute in moles by the volume of the solution in liters. For example, by converting the mass of Na2CrO4 into moles and knowing the volume of the solution, the molarity can be calculated to three significant digits.

Similarly, in Part B, the number of moles of KBr in a given solution can be calculated by multiplying the molarity of the solution by the volume. The amount of moles can then be expressed to three significant digits.

Lastly, in Part C, the volume of the solution needed to obtain a specific number of moles can be determined by dividing the number of moles by the molarity of the solution. The volume can then be expressed in milliliters to two significant digits.

Understanding how to calculate solution concentration, molarity, and volume is essential in various scientific experiments and formulations. These calculations help in determining the appropriate amount of solute needed to achieve specific concentrations in solutions.