# Sn + HNO3: When will the metastannic acid H2SnO3 appear?

I am dissolving tin in nitric acid. What reactions will take place depending on the conentration of $$\rm{HNO}_3$$ and temperature?

Particularly, I am interested when the metastannic acid $$\rm{H_2SnO_3}$$ is likely to be produced, according to

$$\rm{Sn + 4 HNO_3 → H_2O + H_2SnO_3 + 4 NO_2}$$

P. S. References to books or scientific articles are welcome.

[...]Gelatinous, precipitated β-stannic acid has the empirical composition $$\ce{SnO2.4H2O}$$, when air-dried $$\ce{SnO2.2H2O}$$, and when dried in a vacuum, $$\ce{SnO2.H2O}$$; [...]