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Chapter 4: Problem 12

Which of the following must be known to calculate the molarity of a salt solution (there may be more than one answer)? a. the mass of salt added b. the molar mass of the salt c. the volume of water added d. the total volume of the solution Explain.

Short Answer

Expert verified
To calculate the molarity of a salt solution, the necessary information includes: a. the mass of salt added b. the molar mass of the salt d. the total volume of the solution Knowing the mass of salt added and its molar mass helps determine the number of moles of solute. The total volume of the solution is essential in the molarity formula: Molarity = moles of solute / volume of the solution. The volume of water added is not sufficient as it doesn't provide the total volume of the solution.

Step by step solution

01

Option a: The mass of salt added

Knowing the mass of salt added will help us determine the number of moles of solute by using the molar mass of the salt. We can use the mass and molar mass to calculate the number of moles, which is necessary for finding molarity. So, this information is necessary.
02

Option b: The molar mass of the salt

The molar mass of the salt is also crucial to calculate the number of moles of solute, as moles = mass / molar mass. Since the number of moles is a part of the molarity formula, knowing the molar mass of the salt is necessary.
03

Option c: The volume of water added

While knowing the volume of water might seem crucial, it can be misleading as it doesn't give us the total volume of the solution. The molarity depends on the total solution's volume, which can vary from the volume of water added. This can happen when the solute takes up a considerable volume or if there is a contraction or expansion upon mixing. Therefore, knowing the volume of water added is not enough.
04

Option d: The total volume of the solution

The total volume of the solution is crucial, as it's used directly in the molarity formula: Molarity = moles of solute / volume of the solution. This information is necessary to calculate the molarity. #Conclusion# To calculate the molarity of a salt solution, one must know: a. the mass of salt added b. the molar mass of the salt d. the total volume of the solution

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Most popular questions from this chapter

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