[Fito Tuok]

Hi
I would like to ask you how to synthesize bismuth phosphate - BiPO4.
Since it's a salt, I wander if simple salt obtaining methods will work. Like:
Metal + acid = salt + H so Bi + H₃PO₄ = BiPO₄ + 3H
or
Metal oxide + acid = salt + H₂0 so Bi₂O₃ + 2H₃PO₄ = 2BiPO₄ + 3H₂0
Would 75% phosphoric acid work?
Or does it need to be done in another way?

[snorkack]

Hi
I would like to ask you how to synthesize bismuth phosphate - BiPO4.
Since it's a salt, I wander if simple salt obtaining methods will work. Like:
Metal + acid = salt + H so Bi + H₃PO₄ = BiPO₄ + 3H

No.
Look up the position of bismuth in electrochemical series...
oops, electrochemical series as a standard misses a lot of elements. Who presents the full electrochemical series?
Anyway, from
http://en.wikipedia.org/wiki/Standard_electrode_potential_%28data_page%29
Ge⁴⁺ + 4 e⁻    is in equilibrium with    Ge(s)    +0.12
SbO⁺ + 2 H⁺ + 3 e⁻    is in equilibrium with    Sb(s) +  H₂O    +0.20
H₃AsO₃(aq) + 3 H⁺ + 3 e⁻    is in equilibrium with    As(s) + 3 H₂O    +0.24    
Re³⁺ + 3 e⁻    is in equilibrium with    Re(s)    +0.300
Bi³⁺ + 3 e⁻    is in equilibrium with    Bi(s)    +0.308
Cu²⁺ + 2 e⁻    is in equilibrium with    Cu(s)    +0.337

So: Bi, like Cu, Re, As, Sb and Ge, will not react with nonoxidizing acids like HCl or H₃PO₄

or
Metal oxide + acid = salt + H₂0 so Bi₂O₃ + 2H₃PO₄ = 2BiPO₄ + 3H₂0
Would 75% phosphoric acid work?
Or does it need to be done in another way?

Could be.
Phosphoric acid is a medium strength AND tribasic acid and Bi³⁺ is a strongly hydrolyzed cation. Depending on the details of the solubilities of various Bi solid salts in concentrated phosphoric acid, you might end up with (BiO)₃PO₄, or Bi(H₂PO₄)₃, or something else again...

[Fito Tuok]

I have found a cretin reaction on the web:
Bi(NO₃)3 + Na₃PO₄ = BiPO₄ + 3NaNO₃
BiPO₄ is suppose to be insoluble in nitric acid solutions, so participate should be formed.
So, should i solve some bismuth nitrate pentahydrate in 65% nitric acid, and then simply add to this solution Na₃PO₄? Will that work?

Can i use bismuth oxide for this process? Solve it in nitric acid and then add Na₃PO₄?

[AWK]

Any soluble salt of bismuth (of purity over 95 %) and any soluble phosphate or phosphoric acid in diluted nitric acid (HNO₃) will work.