Concentration of a Sodium Chloride Solution D.l Mass of evaporating dish g 40.12

Question

Concentration of a Sodium Chloride Solution

D.l Mass of evaporating dish g                      40.12 g

D.2 Volume of NaCl solution mL                   10.00mL

D.3 Mass of dish and NaCl solution g           50.12g

D.4 Mass of dish and dry NaCl                     43.50g

D.5 Mass of NaCl solution                            10g

D.6 Mass of the dry NaCl salt                      3.38g

D.7 Mass/mass percent   my results is 33.8%(m/m)                            

D.8 Mass/volume percent my result is also 33.8%(m/v)

Explanation / Answer

Mass percent = (mass of solute/mass of solution) * 100 = (3.38/10)*100 = 33.8%(m/m)

Concentration of solution = (amount of solute/mass of solution)*100 = (3.38/10)*100 = 33.8% (m/v)

Concentration of sodium chloride in Molarity = (wt of sodium chloride /MW)*(1000/10) = (3.38/58.44)*(1000/10) = 5.78 moles

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