用0.2/mol/l的醋酸和0.1mol/l的醋酸钠配置PH值为4.15的缓冲溶液100ml,求醋酸,醋酸钠的体积?
问题描述:
用0.2/mol/l的醋酸和0.1mol/l的醋酸钠配置PH值为4.15的缓冲溶液100ml,求醋酸,醋酸钠的体积?
答
设需醋酸xmL,需醋酸钠ymL混合后,c(HAc)= [0.2x/(x+y)] mol/Lc(NaAc)=[ 0.1y/(x+y) ]mol/Lc(H+)=10^-4.15 mol/LHAc ≈ Ac- + H+查数据pKθ =4.74平衡常数Kθ = c(H+) ×c(Ac-)/c(HAc)=【10^4.15...