Question

Separation of Mixtures Experiment

Given information:

1. Mass of evaporating dish: 54.3184g

2. Mass of dish and sodium chloride: 61.1048g

3. Mass of dish and sodium chloride (1st heating): 56.0387g

4. Mass of dish and sodium chloride (2nd heating): 56.0293g

5. Mass of dish and sodium chloride (3rd heating if necessary): N/A

6. Mass of saturated sodium chloride solution: ___

7. Mass of sodium chloride: ___

Question 1) How do I calculate the saturated NaCl solution?

Question 2) How do I calculate the mass of sodium chloride?

Also, can you please confirm that the following formulas are correct?

Mass % of NaCl in saturated solution: mass% = [(mass of NaCl) / (mass of NaCl + mass of saturated NaCl)]

Calculate percent deviation between your value and an accepted literature value of 26.4%: % deviation = [|26.4 - my value| / 26.4] x 100%

Answer 1

1) Mass of saturated NaCl solution = Mass of NaCl+Mass of NaCl (1st heating )+Mass of NaCl (2nd heating)

As saturated solution is the maximum concentration of solute in the solution

Mass of NaCl =   Mass of dish and sodium chloride​ - Mass of evaporating dish = 61.1048g-54.3184g

Mass of NaCl = 6.7864g

Mass of NaCl (1st Heating)= Mass of dish and sodium chloride(1st heating)​ - Mass of evaporating dish

Mass of NaCl (1st Heating)= 56.0387g - 54.3184g = 1.7203g

Mass of NaCl (2nd Heating)= Mass of dish and sodium chloride(2nd heating)​ - Mass of evaporating dish

Mass of NaCl (1st Heating)= 56.0293g - 54.3184g = 1.7109g

Now Mass of saturated NaCl solution = Mass of NaCl+Mass of NaCl (1st heating )+Mass of NaCl (2nd heating)

Mass of saturated NaCl solution = 6.7864g + 1.7203g +1.7109g = 10.2176g

2) Mass of NaCl =   Mass of dish and sodium chloride​ - Mass of evaporating dish = 61.1048g-54.3184g

Mass of NaCl = 6.7864g

Yes the provided formula is correct

Mass% = [(Mass of NaCl )/ (Mass of NaCl + Mass of Saturated NaCl)]

Mass% = [(6.7864g)/(10.2176g)] = 0.6641*100% = 66.41%

% Deviation =  [(my value - literature value)/literature value]*100%

% Deviation = [(66.41-26.4)/26.4]*100% = (40.01/26.4)*100% = 151.55%