In making one liter of a 1.0 M NaCl solution, a student added exactly 1.0 L of water to 58.44 g of NaCl and mixed the two thoroughly. Which error was made?

Molarity = moles of solute/volume of solution (L)

volume of solution = volume of solute + volume of solvent.

but he took already volume of solvent = 1 L

then after addition of NaCl volume of solution will be higher therefor the solution will be less than 1.0 M.

Correct way to make the 1.0 M NaCl is first dissolved 58 .44g NaCl in approx 500 -600 mL water then make the volume up to 1L .

so that total volume of solution will be 1 L

molarity = moles/ V(L) = 1/1 = 1.0 mL

regarding any further query you may ask.

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