Question

How many moles of $HCl$ are present in $0.70{\text{ }}L$ of a 0.33{\text{ }}M\;$$$$HCl solution?

Answer 1

Hydrochloric acid is an inorganic compound which is colourless. Hydrochloric acid is known to have a distinctive pungent smell. It is a corrosive and strong acid and can attack skin. This is because hydrogen chloride is able to dissociate in an aqueous solution. It is also called muriatic acid and has a chemical formula of $HCl$.

Complete step-by-step answer: Hydrochloric acid is a chlorine-based acid system which has water which is simplest. It is a solution of hydrogen chloride and water and a variety of other chemical species, which includes hydronium and chlorine ions. It occurs naturally in the digestive system as it is an important component of gastric acid of most animal species, including humans.
It is used as a food additive and in production of gelatine and often used in leather processing. In the production of polyvinyl chloride for plastic hydrochloric acid is often used. Hydrochloric acid is a strong acid, since it is completely dissociated in water. It can therefore be used to prepare salts containing the chlorine anion called chlorides.
Patients who survive ingestions of $HCl$ may develop stricture formation, gastric atony, and gastric outlet obstruction. $HCl$ is known to cause local pH changes and it also denatures proteins. It thus leads to edema formation and necrosis of tissue. Ingested $HCl$ leads to esophageal damage and stomach.
$Concentration\; = \;amount{\text{ }}of{\text{ }}substance{\text{ }}\left( {moles} \right)/volume{\text{ }}of{\text{ }}solution{\text{ }}\left( L \right)$
thus amount of substance will be:
$= \;Concentration \times volume{\text{ }}of{\text{ }}solution$
$= \;0.33 \cdot mol{L^{ - 1}} \times 0.70L\; = \;0.231\;mol\;HCl$

Note: When hydrochloric acid reacts with sodium hydroxide, it gives a neutralisation reaction where water and salt is made. Hydrochloric acid has a very low $pH$ and being a strong acid, it has a large ${K_a}$ value. hydrochloric acid (aqueous $HCl$) is only as acidic as the strongest proton donor available in water.