配制500mL 20%(密度为1.14g/cm3)的硫酸,需要98%(密度为1.84g/cm3)的硫酸_mL,需水_mL.
问题描述:
配制500mL 20%(密度为1.14g/cm3)的硫酸,需要98%(密度为1.84g/cm3)的硫酸______mL,需水______mL.
答
设需要浓硫酸的体积为V,则根据浓溶液在配制稀溶液时溶质的质量不变得,V×1.84g/cm3×98%=500mL×1.14g/cm3×20%解得V=63.2mL,水的质量为500mL×1.14g/cm3-63.2mL×1.84g/cm3=453.7g,则水的体积为453.7g1g/mL=453...