现有0.5摩尔每升的氢氧化钠40ml,配成0.05摩尔每升的氢氧化钠100ml,

问题描述:

现有0.5摩尔每升的氢氧化钠40ml,配成0.05摩尔每升的氢氧化钠100ml,

按照稀释定律:设需要0.5摩尔每升的氢氧化钠VmL,0.05×100=0.5×V,解得V=10mL.
即取10mL0.5摩尔每升的氢氧化钠,稀至100mL.混匀.配成0.05摩尔每升的氢氧化钠100ml.