Question

将NaOH20g溶于300g水中得密度为1.2g/ml的溶液求NaOH的物质的量浓度

Answer 1

m(溶液) = 20+300 = 320g

V(溶液) = 320/1.2 = 267ml = 0.267L

n(NaOH) = 20/40 = 0.5mol

所以NaOH的物质的量浓度c = 0.5/0.267 = 1.875mol/L