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硫酸、硝酸、盐酸,号称三大强酸.三大强酸各有浓稀之分,虽然浓稀之间没有截然界限,但一般认为,90%以上的硫酸(浓度16.7 mol·L-1,密度1.81 g·mL-1)为浓硫酸,50%以上的硝酸(浓度lO.4 mol·L-1,密度1.31 g·mL-1)为浓硝酸,34%以上的盐酸(浓度10.9mol·L-1,密度1.17 g·mL-1)为浓盐酸,而低于上述浓度的三酸则被认为是稀酸.
Sulfuric acid, nitric acid, and hydrochloric acid are known as the three strong acids. Each of the three strong acids has its own thick and thin points. Although there are no clear limits between the concentrations, it is generally believed that more than 90% of sulfuric acid (16.7 mol·L-1, density 1.81) g·mL-1) is concentrated sulfuric acid, 50% or more of nitric acid (concentration of 10.4 mol·L-1, density of 1.31 g·mL-1) is concentrated nitric acid, more than 34% of hydrochloric acid (concentration of 10.9mol·L- 1, the density of 1.17 g · mL-1) is concentrated hydrochloric acid, and lower than the above concentration of triacid is considered to be dilute acid.