Titration- pre lab. really don't understand

[briteliner]

Homework Statement

suppose a small amount lead (II) chloride got into your Ba(OH)2 sample before titration, contaminating it. how do you think the contamination would affect your calculated concentration for the sample? what about a small amount of FeCl3?

Homework Equations

The Attempt at a Solution

would it just make it less soluble and therefore make the calculated concentration too high? why?

 

[Borek]

Think what reactions will occur after contaminant is added. How do they change the original composition of the solution? How these changes in the composition will be reflected in the final result of your titration?

Note: you have not told what kind of titration you are going to do, so whole thing doesn't make much sense.

 

[Blueshift5]

it is important to understand the process of titration and how contamination can affect the results. In this scenario, the contamination of lead (II) chloride or FeCl3 in the Ba(OH)2 sample can significantly impact the calculated concentration.

First, let's discuss the effect of lead (II) chloride contamination. Lead (II) chloride is a strong electrolyte, meaning it dissociates completely in water. This means that if it contaminates the Ba(OH)2 sample, it will contribute to the overall number of ions present in the solution. As a result, the concentration of Ba(OH)2 will appear higher than it actually is, leading to a falsely elevated calculated concentration.

On the other hand, if a small amount of FeCl3 contaminates the sample, it can also affect the calculated concentration. Iron (III) chloride is a weak electrolyte, meaning it does not dissociate completely in water. As a result, the concentration of FeCl3 in the solution will be lower than its actual value. This will lead to a lower than expected calculated concentration for the Ba(OH)2 sample.

In both cases, the contamination of these substances can significantly alter the results of the titration and lead to inaccurate calculations. Therefore, it is important to ensure that the sample is free from any contaminants before conducting the titration. This can be achieved through proper handling and storage of the sample, as well as careful measurement techniques.