PRE-LABORATORY QUESTIONS work Fully answer these questions in your laboratory no

Question

PRE-LABORATORY QUESTIONS work Fully answer these questions in your laboratory notebook before coming to lab. Show all for numerical calculations. 1. For each anion used in today's experiment: CI, I, Po, So, use the solubility rules to determine if a precipitate SHOULD form when using the reagents in the procedure. 2. Why is emphasis placed on the use of distilled water in the procedure? The nitrate ion, NO,, is in a separate group from the anions used in today's experiment. Suggest a reason why the procedure used today would make the determination of the nitrate ion difficult. 3. 13 I QUALITATIVE ANALYSIS OF ANIONS: PRE-LAB 168

Explanation / Answer

ans)

1.

from the above information that

the following reactions are

Ag+ + Cl- = AgCl

Ag+ + I- = AgI

Ba2+ + PO43- = Ba3(PO4)2

Ba2+ + SO42- = BaSO4

Ksp of AgCl is 1.8×10–10

Ksp of AgI is 1.5 x 10-16

.2)

Distilled water is important so that no other ions are present in the water to interfere with the analysis.

Distilled water is used because no ions can be present in the water used in the experiment.

You are going to identify ions in samples so you cannot introduce ions to the experiment by using tape water, for example.

.3)

here the Nitrate of SIlver and Ba are both solutble in water to a significant concentration

so the presipitation cannot be used to identify this anion.

SO it is different.

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