Mass data for reaction of NaHCO3-Na2CO3 mixture with HCl
Mass of crucible and cover (g): 28.8258
Mass of crucible, cover, and mixture (g): 29.4948
Mass of crucible, cover, and residue after reaction with HCl (g):
1st weighing... 29.4454
2nd weighing... 29.4455
Calculation of percent NaHCO3 and Na2CO3 in an unknown mixture.
mass of unknown mixture used (g)
mass of NaCl formed (g)
Mass of NaHCO3 in unknown mixture (g)
Mass of Na2CO3 in unknown mixture (g)
Percent of NaHCO3 by mass in unknown mixture (%)
Percent of Na2CO3 by mass in unknown mixture (%)
Average percent by mass of other elements in unknown sample (%)
Write 2 mathematical equations using the experimental quantities of your experiment. You must remember that both equations must have identical units on both sides of the equation.
1. Mass of mixture = mass NaHCO3 + Mass Na2CO3
2. Moles NaCl = 2(moles Na2CO3) + 1(mol NaHCO3)
3. mass NaHCO3 = mass mixture - Na2CO3
Given:
MW Na2CO3 = 105.98 g/mol
MW NaCl = 58.44 g/mol
MW NaHCO3 = 84.01 g/mol
Mass of mixture = ?
Mass of NaCl = ?
SOLVE the 2 equations and calculate the mass of NaHCO3 and the mass of Na2CO3.
Calculate the percent NaHCO3 by mass in the unknown mixture, calculate the percent Na2CO3 by mass in the unknown mixture, and the average percent by mass of other elements in the unknown sample (%)