过滤是化学实验的基本操作.(1)做过滤实验时,发现过滤后滤液仍然浑浊.其原因可能是什么?(说出一种

2025-03-28 09:39:40
推荐回答(1个)
回答(1):

(1)过滤的原理是根据固体不能通过滤纸上的小孔,而液体可以通过滤纸上的小孔.凡是不能经过滤器过滤就进入滤液的失误,都能造成滤液浑浊;另外,接滤液的烧杯不干净也会造成同样的结果等等.
(2)

  过滤
原理 溶剂和溶质的分子或离子能透过滤纸,而不溶的固体不能透过滤纸而留在滤纸上
适用范围 分离不溶性固体和液体的混合物或除去混合物中不溶性杂质
方法 用过滤器进行过滤
举例 粗盐提纯
根据以上表格知,过滤法分离混合物要求一者可溶,一者不溶;把固体与液体分离或把可溶的固体与不溶的固体分离.
故答案为:(1)滤纸破损、过滤时液面高出滤纸边缘、承接滤液的烧杯不干净,滤纸与漏斗壁上留有气泡(滤纸润湿后很容易破裂,与漏斗壁之间存在气泡会导致滤纸破裂,影响过滤效果)、玻璃棒靠近了单层滤纸的一面.
(2)用筛子筛粉,筛米,筛砂子,粉丝厂用布袋过滤淀粉、自来水厂净水.

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