The true formula for the product is better represented by [Pt(NO3)n (H2O)6-n]H(4-n), where n can be 1 to 5. Platinum nitrate solution is very susceptible to hydrolysis leading progressively from an increase in apparent viscosity, to gel formation, and in extreme cases, to complete precipitation of orange Pt (IV) oxide.
The rate of hydrolysis depends on the amount of water present (or the concentration of free acid) and the solution temperature. Therefore, this product is closely controlled and contains free nitric acid to give a stable solution.
Platinum nitrate solution is air stable and contains no halide.
Platinum nitrate solution is used to make supported catalysts.
>15.0 % w/w