ANACHEM LEC: GROUP 1 CATIONS

silver group

group I cation is also known as ___

group I cations

the first group represented from the unknown solution in the general cation analysis

6M HCl

group precipitant of group I cations

- high value
- bismuth
- antimony

during the precipitation of the silver group chlorides, the H⁺ ion concentration must be maintained at a relatively ___ to prevent the precipitation of the sparingly soluble oxychlorides of ___ and ___, provided the group II cation is also present in the unknown

heat w/boiling H₂O

what reagent is used?
white ppt. PbCl₂, Hg₂Cl₂/HgCl, AgCl → Pb²⁺, Hg₂²⁺, Ag⁺

6M HCl

what reagent separates Pb²⁺, Hg₂²⁺, Ag⁺?

precipitates into PbCl₂

what happens to Pb²⁺ after 6M HCl?

precipitates into Hg₂Cl₂

what happens to Hg²⁺ after 6M HCl?

precipitates into AgCl

what happens to Ag⁺ after 6M HCl?

hot H₂O

what reagent separates ppt. PbCl₂, Hg₂Cl₂, AgCl?

remains in sol'n as Pb²⁺

what happens to PbCl₂ after hot H₂O?

precipitates as Hg₂Cl₂

what happens to Hg₂Cl₂ after hot H₂O?

precipitates as AgCl

what happens to AgCl after hot H₂O?

- 6M HAc
- 1M K₂CrO₄

what reagent is used?
sol'n: Pb²⁺ → PbCrO₄

6M NaOH

what reagent is used?
PbCrO₄ → sol'n HPbO₂

6M HAc

what reagent is used?
sol'n HPbO₂ → ppt. PbCrO₄

6M NH₄OH through filter

what reagent separates ppt. Hg₂Cl₂, AgCl?

residues as Hg or Hg(NH₂)Cl

what happens to Hg₂Cl₂ after 6M NH₄OH through filter?

remains in sol'n as Ag(NH₃)²⁺ & Cl⁻

what happens to AgCl after 6M NH₄OH through filter?

0.1M KI

what reagent is used?
sol'n: Ag(NH₃)²⁺ & Cl⁻ → ppt. AgI

6M HNO₃

what reagent is used?
sol'n: Ag(NH₃)²⁺ & Cl⁻ → ppt. AgCl

yellow

color of PbCrO₄

yellow

color of Hg residue

white

color of Hg(NH₂)Cl

yellow

color of AgI

white

color of AgCl

lead chloride

chemical name of PbCl₂

mercury (I) album

chemical name of Hg₂Cl₂

silver chloride

chemical name of AgCl

lead (II) chromate

chemical name of PbCrO₄

amino mercuric chloride or ammonobasic mercuric chloride

chemical name of Hg(NH₂)Cl

silver iodide

chemical name of AgI

AgI↓ + 2NH₃

Ag(NH₃)₂⁺ + I⁻ → _____

AgCl↓ + 2NH₄⁺

Ag(NH₃)₂⁺ + Cl⁻ + 2H⁺ → ______

PbCrO₄↓ + 3Ac + 2H₂O

HPbO₂ + CrO₄²⁻ + 3HAc → ______

Hg°₍ᵢ₎ + Hg(NH₂)Cl₍ₛ₎ + NH₄⁺ + Cl⁻

Hg₂Cl₂ + 2NH₃ → _____