Transcript 882FILTRATIONLAB

EXPERIMENTAL YEILD IN THE REACTION
Na2CO3(aq) + CaCl2(aq)  CaCO3(aq) + 2 NaCl(s)
OBJECTIVE : MASS OF CALCIUM CARBONATE PRODUCED
YOU MIXED THE 2 REACTANTS SOLUTIONS, A SOLID AND AQUIOUS
PRODUCT WERE PRODUCED. YOU FILTERED THE SOLID CALCIM
CARBONATE , THE SODIUM CHLORIDE PASSED THROUGH THE FILTER
(AND WAS DISCARDED). THIS WAS A PHYSICAL SEPARATION BASED
ON PHASE, SOLIDS ARE TRAPPED IN THE FILTER. THE YEILD OF
CALCIUM CARBONATE IS WHAT YOU ACTUALLY COLLECTED IN LAB,
SEE CALSS DATA ON SLIDE 5.
DATA…THAT DAY IN LAB YOU REACTED
25.0 mL of 0.20 M Na2CO3(aq) WITH
25.0 mL of 0.20 mL of CaCl2(aq)
EXPERIMENTAL YEILD IN THE REACTION
Na2CO3(aq) + CaCl2(aq)  CaCO3(aq) + 2 NaCl(s)
THEORETICAL YEILD CALCULATION
STEP ONE , CONVERT KNOWNS TO MOLES. YOU ARE GIVEN A
VOLUME AND MOLARITY, THE EQUATION FORM TABLE T IS
MOLARITY = MOLES SOLUTE
LITERS SOLUTION
WE DECIDED TO USE THE SODIUM CARBONATE AS THE KNOWN,
CALCIUM CHLORIDE WOULD ALSO WORK IN THIS LAB.
NOTE 25 Ml = 0.025
MOLARITY = MOLES SOLUTE
LITERS SOLUTION
0.20 = MOLES SOLUTE = .005 MOLES Na2CO3
0.025
EXPERIMENTAL YEILD IN THE REACTION
Na2CO3(aq) + CaCl2(aq)  CaCO3(aq) + 2 NaCl(s)
THEORETICAL YEILD CALCULATION
STEP TWO , DO A MOLE RATIO BETWEEN THE
KNOWN AND THE OBJECTIVE (NaCl)
Na2CO3 1 =
Ca2CO3 1
0.005 MOLES
X MOLES
X= 0.005 MOLES OF Ca2CO3 PRODUCED
YEILD IN MOLES…NOW PUT IN GRAMS TO COMPARE TO
THE MASS YOU MEASURED IN LAB IN GRAMS
MOLAR MASS CALCULATION
Calcium carbonate, CaCO3
1 Ca = 40.078
1 C = 12.011
3 O = 3 x 15.9994
Molar mass of CaCO3 = 100.087 g
STEP THREE…CONVERT MOLES OF OBJECTIVE TO GRAMS.
MOLES = MASS
GFM
0.005 = MASS
100g/mol
Mass CaCO3 = 0.50 grams
% YEILD = EXPERIMENTAL (REAL) YEILD
X 100
THEORETICAL (CALCULATED) YEILD
THE MASS OF CALCIUM CARONATE FOR MANY
GROUPS WAS 0.45g, 0.55g, 0.50g, 0.44g AFTER
DRYING THE CALCIUM CARBONATE ON THE FILTER.
% YEILD = EXPERIMENTAL (REAL) YEILD
X 100
THEORETICAL (CALCULATED) YEILD
% YEILD = 0.45g (ACTUAL LAB MASS) x 100 =90 %
0.50g
% YEILD = EXPERIMENTAL (REAL) YEILD x THEORETICAL
THEORETICAL (CALCULATED) YEILD
X 100
YOUSE YOUR DATA OR THE CLASS DATA TO CALCULATE YOUR
YEILD…YOUR LAB MUST INCLUDE EXTENSIVE DISCUSSION OF THE
CALCULATION.