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QUESTION

# Write the major species in the water solution of Mg(NO3)2 ,FeCl3 ?

The major species are Mg_((aq))^(2+), NO_(3(aq))^-, Fe_((aq))^(3+) and Cl_((aq))^-

If you would like a bit more detail:

Fe_((aq))^(3+) is an Fe^(3+) ion surrounded by 6 water molecules:

[Fe(H_2O)_(6)]^(3+)

The small, highly charged Fe^(3+) ion weakens the O-H bond causing H^+ ions to form making the solution slightly acidic.:

[Fe(H_2O)_6]^(3+)rightleftharpoons[Fe(H_2O)_5(OH)]^(2+)+H^+

Most transition metal salts are acidic for this reason.

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