Acid and Base 2Version en ligne List the different substances in order of increasing acidity from left to right par cécile chapeliere 1 sulphuric acid and hydrochloric acid 2 citric acid in lemon juice / cola 3 acetic acid in vinegar 4 bee sting 5 carbonic acid in fizzy water 6 human skin 7 pure water 8 blood 9 soap 10 sodium hydroxide (in drain cleaner)