Concentration of a Sodium Chloride Solution
Complete the following table as directed:
- Do not include units
- Report answers with the appropriate number of significant digits
- Do not use scientific notation
Mass of empty evaporating dish (g) 29.625
Volume of NaCl solution (mL) 9.8
Mass of dish and NaCl solution (g) 40.307
Mass of dish and dry NaCl (g) 30.949
Mass of NaCl solution (g) ??????
Mass of dry NaCl (g) ?????
Mass/mass percent (%) ??????
Mass/volume percent (%) ?????
Moles of NaCl (mol) ??????
Volume of NaCl solution in liters (L) ??????
Molarity of NaCl solution (mol/L) ??????
(Concentration Calculations Guide)
1. Calculate the mass of the NaCl solution as
2. mass of NaCl solution=mass of dish with solution − mass of empty dish
3. Calculate the mass of dry NaCl as
4. mass of dry NaCl=mass of dish with dry NaCl − mass of empty dish
5. Calculate the mass percent of the solution by dividing the mass of dry NaCl by the mass of NaCl solution and multiplying by 100.
6. mass percent (%m/m)= mass of dry NaCl (g) mass of NaCl solution (g)
×100
7. Calculate the mass/volume percent of the solution by dividing the mass of dry NaCl by the volume of NaCl solution and multiplying by 100.
8. mass/volume percent (%m/v)= mass of dry NaCl (g) volume of NaCl solution (mL)×100
9. Calculate the moles of NaCl by dividing the mass of dry NaCl by its molar mass, 58.5 g/mol.
10.Convert the volume of NaCl from mL to liters using the relationship that 1 L = 1000 mL.
11.Calculate the molarity of the NaCl solution by dividing the moles of NaCl by the volume of NaCl solution in liters. molarity (M)= moles of NaCl
volume of NaCl solution (L)
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