K- percent composition lab-lab data sheet percent composition of sodium carbonate.docx.pdf

Name:_____________________________________ Period:_______ Prelab: _____/15
Safety: _____/4
Lab: _____/81
Data
A.
Mass of foil dish and sodium bicarbonate sample (
NaHCO
3
)
(6 points)
B. Mass of foil dish (6 points)
C.
Mass of sodium bicarbonate sample (
NaHCO
3
) (6 points)
D. Mass of foil dish and sodium carbonate (Na
2
CO
3
) (6 points)
E. Mass of sodium carbonate (Na
2
CO
3
) (6 points)
Post Lab Calculations and Questions
(you must show all work for your calculations in order to receive full credit)
1. What is the name of Na
2
CO
3
? _______________________________________________ (6 points)
2. Calculate the molar mass of Na
2
CO
3
. (6 points)
3. Calculate the % composition of each element in Na
2
CO
3.
( 5 points per element)
% Na:
% C:
% O:
4. Calculate the mass of