What Mass of NaCl is in 0.75 L of 0.115M Solution?
When it comes to solutions, it is important to understand the concept of molarity. Molarity, denoted as M, is a unit of concentration that represents the number of moles of a solute per liter of solution. In this case, we are given a solution with a molarity of 0.115M and a volume of 0.75L. Our goal is to determine the mass of NaCl present in this solution.
To find the mass of NaCl, we need to know the molar mass of NaCl. The molar mass is the mass of one mole of a substance and is calculated by summing the atomic masses of each element in the compound. For NaCl, the molar mass is 58.44 grams per mole.
Now, let’s calculate the number of moles of NaCl in the solution. We can use the formula:
moles = molarity × volume
moles = 0.115 mol/L × 0.75 L
moles = 0.08625 moles
Finally, to find the mass of NaCl, we can use the formula:
mass = moles × molar mass
mass = 0.08625 moles × 58.44 g/mol
mass = 5.037 g
Therefore, the mass of NaCl in 0.75 L of 0.115M solution is approximately 5.037 grams.
Q: What does the molarity of a solution represent?
A: Molarity represents the concentration of a solution and is defined as the number of moles of solute per liter of solution.
Q: How do you calculate molarity?
A: Molarity is calculated by dividing the number of moles of solute by the volume of the solution in liters.
Q: Why is molarity a useful unit of concentration?
A: Molarity allows us to compare the concentrations of different solutions and accurately measure the amount of solute present.
Q: What is the molar mass of NaCl?
A: The molar mass of NaCl is 58.44 grams per mole. This value is calculated by adding the atomic masses of sodium (22.99 g/mol) and chlorine (35.45 g/mol).
Q: How can I convert moles to grams?
A: To convert moles to grams, you need to multiply the number of moles by the molar mass of the substance.
Q: Can the molarity of a solution change?
A: Yes, the molarity of a solution can change if the volume or amount of solute is altered. Adding or removing solute or solvent will affect the molarity.
Q: Why is it important to know the mass of a solute in a solution?
A: Knowing the mass of a solute in a solution is important for various reasons, such as accurately dosing medications, determining the strength of a solution, or ensuring the desired chemical reactions occur.
In conclusion, the mass of NaCl in 0.75 L of 0.115M solution is approximately 5.037 grams. Understanding molarity and using the appropriate formulas allows us to calculate the mass of a solute in a given volume of a solution.