When a chemical is indicated in a process bath, if no other indication is given it is assumed to have a standard concentration in water, according to the table below, where formula, % in weigth and name are indicad for a number of commonly used chemical.

HCL, hydrochloric acid, 37%

HF, hydrofluoric acid, 49%

H2SO4, sulphuric acid, 98%

H3PO4, orthophosphoric acid, 85%

HClO4, perchloric acid, 70%

HNO4, nitric acid, 70%

CH3COOH, acetic acid, 99%

H2O2, hydrogen peroxide, 30%

N2H2, hydrazine, 64%

NH4OH, ammonium hydroxide, 29%

NaOH, sodium hydroxide, 97%

KOH, potassium hydroxide, 85%

Na2O2, sodium peroxide, 93%

If not differently indicated, the composition ratios between different reagents are assumed "by volume".

Remember that all solution must be made with deionized and microfiltered water.