(1) 设l00g污水中含NaOH的质量为x
HCl+NaOH==NaCl+H 2O
36.5 40
36.5×10% x
36.5/40=36.5×10%/x,解得x=4
(2)污水中NaOH的质量分数为:
×100%=4%