Corrosive and sour
Bottles of concentrated acid carry the warning sign of figure 7.2. It says the chemical is corrosive.
Figure to be added
Acids are corrosive
On wood, metals and cloth the acid eats them away, and on the skin it causes severe burns.
A sour taste
Think of the taste of lime juice: it is sour. A characteristic property of acids is their sour taste.
Never taste a laboratory acid
Acids used in the laboratory must never be tasted.