Chemical formulas tell us exactly which elements make up a compound and in what ratios. The formula $Al_2(SO_4)_3$ is an important ionic compound widely used in industries.
Aluminum Sulfate is highly soluble in water.
When dissolved in water, it creates a mildly acidic solution.
It is commonly referred to in Hindi as 'Phitkari' (Alum), though technically Alum is a double salt containing aluminum sulfate.
The chemical name for $Al_2(SO_4)_3$ is Aluminum Sulfate (or Aluminium Sulphate).
Aluminum has a valency of +3. Sulfate has a valency of -2. Using the crisscross method to balance the charges, we need two Aluminum ions to balance three Sulfate ions: $2 \times (+3) = +6$ and $3 \times (-2) = -6$. Hence, $Al_2(SO_4)_3$.
It causes the fine suspended clay particles to clump together (coagulation) and sink to the bottom, clearing the water.
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