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What do the brackets in chemical equations mean?

What do brackets in chemical equations mean? Ca (OH)2

What does the (OH) symbolise?

K2SO4 . Al2(SO4)3 . 24H2O
What does (SO4) here symbolise?

Respuesta :

The bracket just separate an atom or the ion and in the above it means there are two hydroxide molecules
so bracket function is just to  separate ions and molecules
hope it helps