Tl2O3 - THALLIUM (III) OXIDE

Properties of thallium (III) oxide:

Avicennite. Brown-black, non-volatile, melts without decomposition under excessive pressure of O2, decomposes at calcination. It does not react with water, alkalis in solution, ammonium hydroxide. From the solutions of the salts of thallium (III) precipitates as polyhydrate. Shows amphoteric properties; reacts with acids, alkalis during sintering. Strong oxidizer.


Molar mass g/mol 456.76
Density g/cm3 10.11
Melting point °C 717

Methods for preparation of thallium (III) oxide:

4Tl + 2O2 = Tl2O + Tl2O3 (400° C, burning on air),

2Tl + 3H2O2(conc.) = Tl2O3↓ + 3H2O.

4{Tl(NO3)3 • 3H2O} = Tl2O3 + 12NO2 + 3O2 + 12H2O (300° C).

2Tl(NO3)3(diluted) + 3H2O = Tl2O3↓ + 6HNO3.

2Tl(NO3)3 + 6NaOH(diluted) = Tl2O3↓ + 6NaNO3 + 3H2O.

2TlCl3(diluted) + 3H2O(hot) = Tl2O3↓ + 6HCl.

2TlCl3 + 6NaOH(diluted) = Tl2O3↓ + 6NaCl + 3H2O.


Chemical reactions with thallium (III) oxide:

Tl2O3 = Tl2O + O2 (500-1000° C).

Tl2O3 • (n)H2O = Tl2O3 + (n)H2O (to 300° C, vacuum).

Tl2O3 + 8HCl(conc.) = 2H[TlCl2] + 2Cl2↑ + 3H2O.

Tl2O3 + 4H2SO4(conc.) = 2H[Tl(SO4)2] or Tl(HSO4)SO4↓ + 3H2O.

Tl2O3 + 6HNO3(conc.) = 2Tl(NO3)3 + 3H2O.

Tl2O3 + 2MOH = MTlO2 + H2O (450-575° C, M = Li, Na,K, Rb).

Tl2O3 + 2H2 = Tl2O + 2H2O (150-185° C).

Tl2O3 + 3F2 = 2TlF3 + 3O2 (to 550° C).

2Tl2O3 + 5S(powder) = 2Tl2S + 3SO2 (normal temp.).

Tl2O3 + H2O2 = 2TlOH + O2↑ + H2O.


 

Did you know?

There is about 1/2 lb or 250 g of salt (NaCl) in the average adult human body.