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Evan2008木蟲 (正式寫手)
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[交流]
求助分析方法翻譯
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內(nèi)容如下: 稱取2g于110℃±2℃干燥至恒量的樣品,精確到0.0001g。溶于100ml 無水二氧化碳的水中。用鹽酸標(biāo)準(zhǔn)滴定溶液 [c(HCl)=0.5mol/L] 滴定至pH值4.2為終點(diǎn)。 磷酸氫二鈉的質(zhì)量分?jǐn)?shù)w,數(shù)值以"%"表示,按式(1)計(jì)算: ...(省去計(jì)算式) 式中: V——鹽酸標(biāo)準(zhǔn)滴定溶液體積的數(shù)值,單位為毫升(mL); c——鹽酸標(biāo)準(zhǔn)滴定溶液濃度的準(zhǔn)確數(shù)值,單位為摩爾每升(mol/L); M——磷酸氫二鈉摩爾質(zhì)量的數(shù)值,單位為克每摩爾(g/mol)[M(Na2HPO4)=141.96]; m——樣品質(zhì)量的數(shù)值,單位為克(g)。 |
禁蟲 (職業(yè)作家)
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Take 2g (precise to 0.0001g) of the sample which was dried at 110℃±2℃ until constant weight. Then dissolve the sample into 100ml anhydrous carbon dioxide. Finally conduct titration with standard chloride acid solution (c=0.5mol/L) until the pH value equals 4.2. The mass of disodium hydrogen phosphate, in percentage, can be calculated by Equation (1). Xxxx in which, V is the volume of chloride acid, mL C is the concentration of chloride acid, mol/L M is the molar mass of disodium hydrogen phosphate, g/mol M is the mass of the sample, g |
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