methods of preparing insoluble salts

METHODS OF PREPARING INSOLUBLE SALTS

GROUP 3:TRUONG NGOC DIEMLY NGOC DIEMHUYNH THI HANHHUYNH PHUC DUONG

THE MAINT POINT

Definition of insoluble salt.Methods of preparing insoluble salts.The experiment about insoluble salts.Summary.

DEFINITION OF INSOLUBLE SALTS

Insoluble salt is salt that not dissolves in water at temperature.

A Precipitate is an insoluble solid that forms when 2 or more soluble reactants are combined.

Figure 1.1 Precipitation of Group I Chloride Figure 1.2 Fe+3 thiocyanate complex

Common precipitates:

Figure 1.3 Precipitation of lead chromate Figure 1.4 Precipitation of silver chloride

Figure 1.5 Precipitation of group II sulfides Figure 1.6 Formation of Cu2+ ion

Figure 1.7 Formation of Ni2+ complex Figure 1.8 Formation of MnO4- ion

Methods of preparing insoluble salts

Mix the two solutions –a precipitate will form. Filter the mixture. Rinse the solid with distilled water and allow to dry.

The experiment about insoluble salts

BaCl2 Na2SO4Ba2+

Cl-Na+

SO42-

NaCl

BaSO4

The reaction

BaCl2(aq) + Na2SO4(aq) 2NaCl(aq) + BaSO4(s)

The ionic equation

Ba2+(aq)

+ SO42- (aq) BaSO4(s)

summary

This methods is called double decomposition

Soluble salt +soluble salt insoluble + soluble salt

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