Chemistry Lab homework help

Anonymous
timer Asked: Jul 11th, 2017
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give real number for the lab and complete the whole report with the questions.

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Chemistry Lab homework help
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Tutor Answer

ProfHenryM
School: UC Berkeley

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Surname 1
Student’s Name
Instructor
Course
Date
Properties of Lead (II), Silver and Mercury (I) Ions
Introduction
The chemical property of lead (II), silver and mercury (I) cations to forming water-insoluble
chlorides can be used for qualitative analysis. Notably, the three cations are referred to as the
silver group as the aforementioned chemical property enables them to be separated from most of
the other cations. In a qualitative analysis experiment of the mentioned cations, selected
chemical reactions for each of the ions are performed. A scheme of analysis based on the
reactions is then used to separate and identify the cations in a ‘known’ solution containing all
three ions and in an ‘unknown’ solution containing one or more of the ions.
Net ionic equations are followed during the reactions and can be used to explain what is
observed during qualitative analysis. The equations are:
Lead (II) [Pb(NO3)2 solution]
Pb2+ (aq) + 2Cl- (aq) → PbCl2(s) (white precipitate forms)
Heat
PbCl2 (s) →

Pb2+ (aq) + 2Cl- (aq) (ppt dissolves)

H2O
Pb2+(aq) + CrO42-(aq) → PbCrO4(s) (bright yellow solid)
Silver [AgNO3 solution]
Ag+(aq) + Cl-(aq) → AgCl(s) (white ppt forms)

Surname 2
AgCl(s) + 2NH4OH (aq) → Ag(NH3)2+ (aq) + Cl-(aq) + 2 H2O (l) (ppt dissolves)
Ag(NH3)2+ (aq) + Cl-(aq) + 2H+(aq) → AgCl(s) + 2NH4+ (white ppt forms)
Mercury [Hg2(NO3)2 solution]
Hg22+ (aq) + 2Cl- (aq) → Hg2Cl2(s) (white ppt forms)
Hg2+(aq) + NH3(aq) + Cl–(aq) + H2O(liq) → HgClNH2(s) + H3O+(aq) (black ppt
forms)
Materials and Equipment
i.

Concentrated (15 M) Ammonium Hydroxide (NH4OH)

ii.

Dilute (6 M) Hydrochloric acid (HCl)

iii.

0.1 M Lead (II) Nitrate [Pb(NO3)2]

iv.

0.1 M Mercury (I) Nitrate [Hg2(NO3)2]

v.

Dilute Nitric acid (HNO3)

vi.

0.1 M Potassium Chromate (K2CrO4)

vii.

O...

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Anonymous
Excellent job

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