Normality (N) defined as the number equivalent per liter of the solution. A one-normal solution contains one equivalent per liter of solution. What is an equivalent? An equivalent represents the mass of material providing Avogadro's number of reacting units. A reacting unit is a proton or electron.
1N盐酸=1mol/L盐酸
3N磷酸=1mol/L磷酸
2N硫酸=1mol/L硫酸