Question

In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

October 1, 2024

Answer

In the manufacture of sodium hydroxide, hydrogen gas and chlorine gas (X) are formed as by-products. When chlorine gas (X) reacts with lime water, it forms calcium oxychloride (bleaching powder) Y. The reactions are

2𝑁𝑎𝐶𝑙(𝑎𝑞) + 2𝐻₂𝑂(𝑙) → 2𝑁𝑎𝑂𝐻(𝑎𝑞) + 𝐶𝑙₂(𝑔) + 𝐻₂(𝑔)

𝑋 − 𝐶𝑙₂ (𝐶ℎ𝑙𝑜𝑟𝑖𝑛𝑒 𝑔𝑎𝑠

𝐶𝑎(𝑂𝐻)₂(𝑠) + 𝐶𝑙₂(𝑔) → 𝐶𝑎𝑂𝐶𝑙₂(𝑠) + 𝐻₂𝑂(𝑙)

𝐿𝑖𝑚𝑒 𝑤𝑎𝑡𝑒𝑟

𝑌 − 𝐶𝑎𝑙𝑐𝑖𝑢𝑚 𝑜𝑥𝑦𝑐ℎ𝑙𝑜𝑟𝑖𝑑𝑒 (𝑏𝑙𝑒𝑎𝑐ℎ𝑖𝑛𝑔 𝑝𝑜𝑤𝑑𝑒𝑟)

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Question

In one of the industrial processes used for manufacture of sodium hydroxide, a gas X is formed as by-product. The gas X reacts with lime water to give a compound Y which is used as a bleaching agent in chemical industry. Identify X and Y giving the chemical equation of the reactions involved.

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