14. As a solution containing 158 g dm of Nas, dm
B was obtained by dissolving 9.0 g of an impure sample of lain aqueous KI and the solution made up to
Put A into the burete. Pipette 25.0 cm of B. Use starch solution as indicator Repeat the titration to obtain
concordant titre values
Complete the table and calculate the average volume of Aused
Buretle readings/em!
1
2
Final reading
14.30
28.50
6.55
Initial reading
0.00
Volume of A used/em!
14.00
14.10
The equation for the reaction involved in the titration is:
T25.01.21 S. O.
From your results and information provided, calculate the:
a) Concentration of A in moldm?
b) Concentration of 12 in B in moldm':
c) Percentage by mass of I2 in the sample.
10-16.0. Na - 23.0, S - 32.0.1 - 127.01
110