# Lab41

Topics: Titration, Burette, Laboratory Pages: 2 (279 words) Published: April 8, 2013
Experiment 7: Analysis of an Unknown Chloride

Objectives
Experimental
The objective of this experiment was to identify the molarity of a solution of chloride. Laboratory
In lab we had to perform titrations and carefully read the burets. Data and Calculations: Analysis of Unknown Chloride
Molarity of Standard AgNo3 solution 0.02785M
I IIIII
Initial buret reading0.00 mL 0.00 mL 0.10 mL

Final buret reading17.00 mL 16.40 mL 17.50 mL

Volume of AgNo3 used
to titrate sample17.00 mL16.40 mL 17.40 mL

No. of moles of
AgNo3 used
to titrate samplemol=VxM mol=VxMmol=VxM
0.01700Lx0.02785mol/L 0.01640Lx0.02785mol/L 0.01740Lx0.02785mol/L
4.735x10-4mol4.567x10-4mol4.846x10-4mol
No. of moles of
Cl – present in
sample 4.735x10-4mol4.567x10-4mol4.846x10-4mol
Volume of diluted
chloride sol. pipetted 10mL10mL 10mL
Total moles of Cl-
Cl-concentration
in diluted solution
=4.735x10-3mol=4.567x10-3mol=4.846x10-3mol
.01L .01L .01L
=0.4735 M=0.4567 M=0.4846 M

Mean chloride
concentration=0.4716 M

Unknown number Cl-13

Discussion
In this lab we are trying to find the amount of Cl- in a sample we know that Ag+ will bond with Cl- with a 1 to 1 ratio to form a precipitate. When we go from grams of Ag+ to moles of Cl- we can find out how much Cl- was in the unknown sample.