Question

You are given a sample of an unknown aqueous substance. After performing several tests on the compound, you discover that it turns blue litmus paper red and that reacts with sodium hydroxide (NaOH), which is a base, to form a salt (NaCl) and water. As a result, you conclude the unknown substance to be:

Answer 1

The unknown substance is hydrochloric acid (HCl).

Explanation:

We know that the litmus paper turn red in acid conditions and blue in basic conditions. From this we know that our unknown compound is an acid.

Knowing that our unknown substance (HA) and sodium hydroxide will produce sodium chloride and water we can conclude that the acid is hydrochloric acid (HCl).

The chemical reaction is:

HCl + NaOH → NaCl + H₂O

Learn more about:

acid and bases

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