Question

write the Effect of impurities:​

Answer 1

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i) When soluble substance such as common salt (i.e., sodium chloride) is dissolved in water, the surface tension of water increases.

ii) When a sparingly soluble substance such as phenol or a detergent is mixed with water, surface tension of water decreases. For example, a detergent powder is mixed with water to wash clothes. Due to this, the surface tension of water decreases and water makes good contact with the fabric and is able to remove tough stains.

iii) When insoluble impurity is added into water, surface tension of water decreases. When impurity gets added to any liquid, the cohesive force of that liquid decreases which affects the angle of contact and hence the shape of the meniscus. If mercury gathers dust then its surface tension is reduced. It does not form spherical droplets unless the dust is completely removed.

Answer 2

Explanation:

Impurities may bring about incompatibility with other substances. Impurities may lower the shelf life of the substances. Impurities may cause difficulties during formulations and use of the substances. Sometimes Impurities changes the physical and chemical properties of the substances