Write the uses of solid sodium hydroxide on large scale?

Caustic soda is used in many industries on a large scale, such as in soap-making to saponify fats (turn them into soap by alkali treatments) and in bauxite-processing to manufacture aluminium.

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Below is the uses of sodium hydroxide(solid) in different area,

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"hydrogen bonding is the attraction of h atoms in the water molecule (slight + charge) to o atoms in a neighboring water molecule (slight - charge); it is a weak interatomic force. but it is still strong enough to the water molecules "stick" together."