Sodium chloride +H2O = sodium hydroxide+chlorine gas+H2

n n n n/2 (2n-n)/2

(1) Therefore, let the NaCl coefficient be n.

Through Na conservation, the NaOH coefficient is deduced to be n,

From the conservation of Cl, Cl? The coefficient is n/2,

(2) by the coefficient n of sodium hydroxide,

According to the conservation of o, h? The coefficient of o is n,

3 by h? O, and the coefficient of NaOH,

According to the conservation of h, h? Coefficient of (2n-n)/2

■ At this time, the coefficients are uncertain, and all of them contain n. In a mathematical sense, any value of n is valid. According to chemical requirements, the coefficient should be the simplest integer, so n takes 2.

2NaCl+2H？ O=2NaOH+Cl？ + H？