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配置PH=7.45的缓冲溶液80ML需要0.2mol/LNa2hpo4和0.2mol/Lkh2po4溶液的体积积数

题目详情
配置PH=7.45的缓冲溶液80ML需要0.2mol/LNa2hpo4和0.2mol/Lkh2po4溶液的体积积数
▼优质解答
答案和解析
H2PO4- H+ +HPO42- Ka2(H3PO4)=6.23*10^-8(数据来自师范院校Ka2(H3PO4)=[H+]*[HPO42-] / [ H2PO4- ]=约=[H+]*c(HPO42-) / c(H2PO4- )= [H+]*n(HPO42-) / n(H2PO4- )n(HPO42-) / n(H2PO4- )= Ka2(H3PO4)/[H+]=6.23*10...