Question

PH=2的盐酸与PH=4的盐酸按体积比2:3混合后溶液的PH值是多少?

Answer 1

pH=2即c(H+)=0.01mol/L

pH=4即c(H+)=0.0001mol/L

设体积分别为2V和3V

则混合后n(H+)=0.01*2V+0.0001*3V=0.0203V

c(H+)=0.0203V/(2V+3V)=0.00406mol/L

pH=2.4