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【简答题】

试画出三聚磷酸钠的结构。将三聚磷酸钠添加到洗衣粉中起什么作用?提供三聚磷酸钠的替代物。

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【单选题】下列有关普通洗衣粉与加酶洗衣粉的区别的叙述,正确的是()

A.
普通洗衣粉中含磷,会污染环境
B.
表面活性剂只存在于普通洗衣粉中,会产生泡沫,可以将油脂分子分散开
C.
加酶洗衣粉中的酶制剂对人体有毒害作用
D.
加酶洗衣粉是将酶直接添加到洗衣粉中

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A.
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【单选题】据报道,我国已有多个城市禁止生产和销售含磷洗衣粉(含三聚磷酸钠),其主要原因是 [ ]

A.
磷元素有毒
B.
磷酸根离子水解使水体酸度增大
C.
磷酸根离子与某些阳离子形成沉淀,使水体浑浊
D.
含磷污水引起浮游生物大量繁殖,导致水体恶化