what makes an acid an acid?

4 answers

By definition, the property of having more Hydromonium ions that hydroxide ions makes the compound acidic.
hi i would like to ask 2 questions:

1.why do we pickle some foods? how does it work?

2.what equipment should we use to gring red cabbage to make a indicator?

thank you
it becomes an acid due to which colour it turns when adding universal indicator
i.e 1-6 acid
7 neutral
and numbers after that are alkalis