The pH of a 40% aqueous solution of sodium bisulfite typically ranges from 3.6 to 4.6.
Sodium bisulfite (NaHSO3), also known as sodium hydrogen sulfite, is an acidic salt. When dissolved in water, it undergoes hydrolysis, producing sulfurous acid (H2SO3) and hydroxide ions (OH-). However, the formation of sulfurous acid causes an increase in hydrogen ions (H+), leading to an acidic pH.
The pH range provided (3.6 - 4.6) indicates that sodium bisulfite solutions are moderately acidic. The exact pH can vary depending on the concentration of the solution and the presence of other substances.
