设：盐酸质量分数为xNaOH + HCl= H2O + NaCl40 36.5 200g*4% 150g*x40:8=36.5:150g*xx=4.9%错了不管
(1) 200*4%/40 == 150X/36.5(2) X == 0.0487 == 4.9%
5.3%
