Answer:
Results from method B is more reliable than method A.
Explanation:
The two method that are used for the analysis produced different results. The first method that is method A gives higher value of the iodine content than the method B.
When
was added to water, method A showed an increased in the iodine content and it increases with the increase in the amount of
.
Where as in the method B, there is no change in the results. Therefore the measurements provided by the method A shows an inference of
ion.
The measurement of the iodine content is affected by the presence of the ion
in water.
Since in method B there is no change in measurement, it is independent of the presence
ion in water.
As higher iodine content is given by method A, so
ion must be present in original water that must be interfering the measurement. Hence, method B is more reliable.
Answer : The concentration of a solution with an absorbance of 0.420 is, 0.162 M
Explanation :
Using Beer-Lambert's law :

As per question, at constant path-length there is a direct relation between absorbance and concentration.

where,
A = absorbance of solution
C = concentration of solution
l = path length
= initial absorbance = 0.350
= final absorbance = 0.420
= initial concentration = 0.135 M
= final concentration = ?
Now put all the given value in the above relation, we get:


Thus, the concentration of a solution with an absorbance of 0.420 is, 0.162 M
Answer:
I dont speak this language sorry :(
Explanation: