Question

chemical formula of hard water

Answer 1

There is no specific formula for hard water.Hard water is just water with a high amount of dissolved minerals in it like calcium and magnesium. Water containing high CA+&Mg+ions which remains soluble even after boiling are permanent hardness...
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Answer 2

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☞Chemical formula of heavy water is $\sf{ D_2O}$✔✔

☞Chemical formula of water is $\sf{ H_2O}$✔✔

KNOW MORE-:

→$\large\purple{Chemical \:formula \:of\: oxygen}$$\large\purple{\:is\: O_2✔✔}$

→$\large\green{Chemical \:formula \:of\: hydrogen}$$\large\green{\: is \:H_2✔✔}$

→$\large\orange{Chemical\: formula\: of\: carbon }$$\large\orange{\:dioxide\: is\: CO_2✔✔}$