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表2 硫酸铜中铜含量测定计算表(临近终点加入KSCN)

${c_{{\rm{CuS}}{{\rm{O}}_{\rm{4}}}}}$/(mol·L?1) 次数 ${c_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/(mol·L?1) * ${V_{{\rm{KI}}}}$/mL ${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL ** ${V_{{\rm{KSCN}}}}$/mL ${V_{{\rm{N}}{{\rm{a}}_{\rm{2}}}{{\rm{S}}_{\rm{2}}}{{\rm{O}}_{\rm{3}}}}}$/mL ${\rho _{{\rm{Cu}}}}$/(g·L?1) ${\rho _{{\rm{Cu}}}}$/(g·L?1) * RAD/% 0.025 1 0.02707 4 19.50 2.5 22.75 1.565 1.568 0.10 2 0.02707 4 20.00 2.5 22.80 1.569 3 0.02707 4 19.80 2.5 22.80 1.569 0.05 1 0.05276 8 22.50 5 23.88 3.203 3.200 0.06 2 0.05276 8 22.00 5 23.85 3.199 3 0.05276 8 22.60 5 23.85 3.199 0.1 1 0.1024 8 19.00 10 20.25 5.271 5.268 0.07 2 0.1024 8 19.00 10 20.25 5.271 3 0.1024 8 19.00 10 20.22 5.263