The Ph
Bicarbonate is a basic substance.
HCl is considered an acidic substance.
Coffee is considered to be an acidic substance.
In chemistry, bicarbonate is considered a basic substance.
The substance with a pH of 13 is strongly basic. Substances with pH values greater than 7 are considered basic, and the higher the pH value, the stronger the basic nature of the substance.
The substance has a low pH level, indicating that it is acidic.
Neither - there is no such substance.
Yes, a low pKa of a substance indicates its acidic nature.
Ph tells you how acidic/basic a solution is. It is a measure of the relative concentrations of H+ ions to OH- ions.
A substance that is neither acidic nor basic is considered neutral. Water at room temperature is an example of a neutral substance, as it has a pH of 7.
The pH of a substance tells if it's an acid, neutral, or a base. With all deference to the asker and to the previous answerer, technically substances don't have pH's. Aqueous solutions have pH's, and the pH tells you (on a logarithmic scale) the concentration of H+ (or more precisely H3O+) in that solution. A substance is an acid if it lowers the pH of a solution when it is dissolved. It does this by donating protons (H+'s) to water molecules to create more H3O+. A substance is a base if it increases the pH of a solution by accepting a proton from water molecules to form OH-. H3O+ and OH- are in equilibrium with each other in solution, so the more OH- you create, the less H3O+ will be in solution and the higher the pH. So a better answer to the question is that "The pH of a solution tells you if its an acidic, neutral, or basic solution."
The reason for a pH scale it to tell how basic or acidic a substance, or substance byproduct is.