# Qualitative Analysis of Group I Cations Experiment

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## 15 Questions

PbCl2

Pb2+

ions

### Resulting in the precipitation of AgCl(s), PbCl2(s), and Hg2Cl2(s): AgNO3 + HCl → AgCl ↓+ HNO3 Pb(NO3)2 + 2HCl → PbCl2↓ + 2HNO3 Hg2(NO3)2 + 2HCl → Hg2Cl2↓+ 2HNO3

addition of 6 M HCl (aq)

### Their separation from all other ions may be accomplished by the addition of 6 M HCl (aq) resulting in the precipitation of AgCl(s), PbCl2(s), and Hg2Cl2(s)

insoluble chlorides

AgCl

### What is the increased solubility at higher temperatures used for in the separation of lead(II) chloride?

Dissolving lead(II) chloride in hot water

### What is the confirmation of the presence of Pb2+ in the aqueous solution?

Formation of a yellow precipitate of PbCrO4 upon addition of aqueous K2CrO4

### How can lead(II) chloride be separated from the other two chlorides?

By its increased solubility at higher temperatures

### What happens when Hg2(NO3)2 reacts with 2HCl?

Formation of Hg2Cl2

### Match the following ions with their corresponding insoluble chlorides:

Ag+ = AgCl Pb2+ = PbCl2 Hg22+ = Hg2Cl2 Cl- = PbCrO4

### Match the following reactions with their resulting precipitates:

AgNO3 + HCl = AgCl ↓ Pb(NO3)2 + 2HCl = PbCl2↓ Hg2(NO3)2 + 2HCl = Hg2Cl2↓ Pb2+ (aq) + CrO4−2 (aq) = PbCrO4

### Match the following substances with their primary role in separation:

6 M HCl (aq) = Precipitation of insoluble chlorides Hot water = Increased solubility of PbCl2 Aqueous K2CrO4 = Confirmation of Pb2+ presence AgNO3, Pb(NO3)2, Hg2(NO3)2 = Formation of precipitates

### Match the following substances with their respective uses in the process:

AgNO3, Pb(NO3)2, Hg2(NO3)2 = Formation of precipitates 6 M HCl (aq) = Separation from other ions Hot water = Dissolving lead(II) chloride Aqueous K2CrO4 = Confirming presence of Pb2+

### Match the following statements with their corresponding processes:

Addition of 6 M HCl (aq) = Separation from all other ions Increased solubility at higher temperatures = Dissolving lead(II) chloride Formation of yellow precipitate of PbCrO4 = Confirmation of Pb2+ presence Precipitation of AgCl, PbCl2, and Hg2Cl2 = Resulting from addition of HCl

Explore the practical aspects of qualitative analysis by learning to separate and identify ions in a known mixture of Group I cations. Apply this analytical scheme to identify ions in an unknown mixture, gaining hands-on experience in analytical chemistry.

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