On a laboratory scale, sulfuric acid can be diluted by pouring concentrated acid onto crushed ice made from de-ionized water.

Typically, gelatin can be dispersed in a relatively concentrated acid.

Dilute acid may be used under high heat and high pressure, or more concentrated acid can be used at lower temperatures and atmospheric pressure.

Adding concentrated acid reverses the equation, and the copper ions go back into an aqueous solution.

Unfortunately, acid digestion involves numerous manipulations of concentrated acids.