Interaction | Reaction | Process     Data Page

When iron(III) sulfate pentahydrate dissolves in water it forms the pale violet hexaaquairon(III) complex ion which is a weak Brønsted acid and will donate a proton to water. The solution will have a pH of about 3. This process is called "hydrolysis" or "acidity reaction".

Even though the reaction has an equilibrium which lies to the left, the rust brown colour of the pentaaquahydroxyiron(III) complex ion will obscure the pale violet of the hexaaquairon(III) complex ion.

Addition of aqueous acid will move the equilibrium to the left, and aqueous alkali will move it to the right.



Reactant Page Go To Go To
Iron(III) sulfate pentahydrate     Reactions Using    Reactions Forming
Water     Reactions Using    Reactions Forming
Hexaaquairon(III) ion     Reactions Using    Reactions Forming
Sulfate ion     Reactions Using    Reactions Forming

Interaction, Reaction, Process defined as:
British A-Level Chemistry: A2
Proton transfer: Brønsted reaction
Type 23 Lewis Acid/Base Complexation Chemistry

© Mark R. Leach 1999 –

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