Gastric juice is a liquid produced by the stomach which is essential for breaking down food and absorbing nutrients. It is made up of hydrochloric acid, enzymes (such as pepsin), water and salts.

A cotton swab is dipped into concentrated hydrochloric acid (producing hydrogen chloride gas) while a second on is dipped into concentrated aqueous ammonia (producing ammonia gas). Both cotton swabs ...

Acids have a sour taste – but it is much too dangerous to taste a liquid to find out if it is an acid! So, other ways of detecting acids need to be used. Strong acids such as hydrochloric acid ...