# precipitation reaction - cellulose in schweizer reagent reacts with acid

In the regeneration of dissolved cellulose (in a cuprammonium solution) in an acid bath, say sulphuric acid, what is the chemical reaction?

There is a lot about the chemistry of the production of the copper ammonia complex but nothing about the precipitation step.

Is the precipitation possible with any acid?

Apologies about the tag - can't find any existing ones that are appropriate

It's possible to regenerate cellulose from Schweizer's reagent by dilution in plain water, though neutralization of the high pH+ cuprammonium solution with an acid is more efficient. $\ce{HCl}$ works as well as $\ce{H2SO4}$. Economics probably drives the choice.