参考答案和解析
正确答案:
设需要KH2PO4 xg,KCl yg .
x×31.0 /(39.1 + 1.0×2 + 31.0 + 16.0×4)
= (100/1000)×(1000/1000) ×(31.0×0.2)/(31.0 2 + 16.0×5)
x×39/(39.1 + 1.0×2 + 31.0 + 16.0×4)+ y ×39.1 / (39.1 + 35.5)
= (100/1000)×(1000/1000)×(39.1×2)/(39.1×2 + 16.0)
解得:x =0.192,y = 0.0533