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This is about determining the exact concentration of HCl

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This is about determining the exact concentration of HCl. Based on the information below, what can you conclude about this lab? What is the deviation?

Results:

THAM molar mass: 121.1 g/mol	Sample 1	Sample 2	Sample 3
Weight of THAM	.8157 g	.8121 g	.8136 g
Final buret (ml)	20.5 ml	20.6 ml	44.5 ml
Initial buret (ml)	0.0 ml	0.0 ml	23.9 ml
Total Volume of HCl (ml)	20.5 ml	20.6 ml	20.6 ml
Total Volume of HCl (L)	.02050 L	.02060 L	.02060 L
HCl Molarity (Calculated)	.3285 M	.3254 M	.3260 M

 

Calculations

HCI Molarity:

Trial 1#: .3285 M Trial #2: .3254 M Trial #3: .3260 M

Best Average Value: .3266 M 

% Deviation: ?

M1V1=M2V2

V1=.3 M ×500 ml/ 12 M=12.5 ml HCl