Question

Explain why? (a) Common salt becomes sticky during the rainy season. (b) Blue vittriol change to white upon heating.

Answer 1

Explanation:

1. Magnesium chloride is the common impurity present in table salt. Magnesium chloride highly hygroscopic and absorbs moisture from air. ... Common salt is used to bring artificial rains when big clouds are present because it absorb water to become small water particles, then bigger particles and pour as rain.
2. Blue vitriol is hydrated Copper(II) Sulphate, meaning CuSO4. ... When blue vitriol is heated, those water of crystallization escape out of the crystal and what's left is anhydrous copper sulphate or simply CuSO4, without any water of crystallization

Answer 2

Answer:

here's your answer

(a) common Salt becomes stickey because it contain impurity of magnesium chloride (MgCl2) and it is deliquescent in nature so when it is exposed to atmosphere it becomes moist and it's moisture is felt to be stickey.

(b) blue vitriol means hydrated copper sulphate (CuSO4) and it contain water of crystallization So, copper sulphate has a tendency to change its colour when it comes in contact with water. Anhydrous copper sulphate is white in colour and when it comes in contact with moisture, it changes to blue colour. It's because of the water of crystallisation that links with it.

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