Question

物质的量浓度相同的氨水和碳酸氢氨的PH值怎么比较

Answer 1

NH3·H2O=NH4++OH- 设浓度C=0.1mol/L,K=[NH4+][OH-]/[NH3·H2O],[OH-]^2=KC=1.8*10^-5*0.1,[OH-]=1.34*10^-3,PH=12.13

NH4HCO3情况比较复杂,既有水解又有电离,设浓度C=0.1mol/L,最后PH=7.8.