The scale is exponential a change of one unit is actually a ten-fold change. A solution with pH of 1 has ten times as much acid as a solution with pH of 2.
Acids are substances that can provide a hydrogen ion.
6.02246 x 10 to the 23rd power, the number of molecules required to make up a molecular weight in grams. Go to Index. Add a bunch of alkali, the buffer changes back to its original state. A buffer system consists of a weak acid combined with its salt. When acid is added to a buffer solution, the resulting change in pH is less than it would have been if the buffer were not present.