NaOH+HCl=NaCl+H2O 40 58.5 100*16% XX=58.5*100*16%/40=溶液中溶质的质量分数=X/(100+100)
100g*0.16=16g NaoH+Hcl=H2O+Nacl Nacl=18.6g 18.6/200=百分之9.3
40/36.5=x/50*7.3%X=40g
