acids, bases and alkalis

strong acid

acid that completely dissociates in aqueous solution

weak acid

acid that does not completely dissociate in solution

H⁺

hydrogen ion;

proton;

OH⁻

hydroxyl ion

pH

measure of acidity or alkalinity

pH scale

quantitative scale used to measure the concentration of H+ ions in a solution

acid

any compound that forms hydrogen ions in solution;

a proton donor;

any solution that has a pH below 7;

alkali

any compound that produces hydroxyl ions in solution;

a proton acceptor;

any solution that has a pH above 7;

base

a proton acceptor

dissociate

compound separates into ions when dissolved in water

acidic

pH less than 7

alkali or basic

pH more than 7

indicator

compound that changes color in the presence of an acid or a base

corrosive hazard

having the tendency to erode or eat away

environmental hazard

substance that can cause harm if released into environment

poison hazard

substance capable of producing a harm in a biological system