Question

you have a box of sodium chloride (salt), which has a molecular weight of 58.4 grams/mol. you weigh out 5.84 grams of sodium chloride and dissolve it in water to give a total volume of 0.2 liter. what is the molarity (m) of the solution that you have made?

Answer 1

Molarity (M) is a unit of concentration that expresses the number of moles of solute (in this case sodium chloride) per liter of solvent (water). To calculate the molarity of the solution, you need to know the number of moles of sodium chloride present and the total volume of the solution.

To find the number of moles of sodium chloride present, you can use the formula:

moles = mass / molar mass

where mass is the amount of sodium chloride you weighed out (5.84 grams) and molar mass is the molecular weight of sodium chloride (58.4 grams/mol).

moles = 5.84 / 58.4 = 0.1

To find the molarity of the solution, you can use the formula:

molarity = moles / liters

where moles is the number of moles of sodium chloride present (0.1) and liters is the total volume of the solution (0.2 liters).

molarity = 0.1 / 0.2 = 0.5 M

So the molarity of the solution is 0.5 M