This requires two equations and they are solved simultaneously.
Let X = mass NaCl and
Let Y = mass KCl
equn 1 is X + Y = 0.774 g
To save typing mm = molar mass then
equn 2 comes from
mols AgCl due to NaCl + mols AgCl due to KCl = total mols AgCl formed
[X(mm AgCl/mm NaCl)] +[Y(mm AgCl/mm KCl)] = MAgNO3*LAgNO3
Solve those two equations simultaneously to obtain X = grams NaCl and Y = grams KCl.
Then %NaCl = (X/mass sample)*100 = ?
%KCL = (Y/mass sample)*100 = ?
Post your work if you get stuck.
A 0.774 g
mixture containing only sodium chloride and potassium chloride was dissolved in water. It required 29.6 mL
of 0.416 M AgNO3
to completely precipitate all of the chloride present. What is percent composition by mass of sodium chloride and potassium chloride in the mixture?
1 answer
1 answer