Question

why do HCl+ Noah~ NaCl+h2o

Answer 1

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Here is your answer
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It is a nutralization reaction, in which a base reacts with an acid to neutralize it's effect, and the by-products are salt and water.

HCl is an acid and NaOH is a base.

The reaction took place
and NaCl (salt) and water is produced.

Answer 2

HCl is an acid. NaOH is a base. Whenever an acid and a base reacts with each other, they form salt and water as products. That's why when HCl (acid) reacts with NaOH ( base) , they form NaCl ( salt) and H2O( water).