Here is what the definitions are:
Minerals from food that are not oxidized during metabolism leave an ash, or residue, in the urine.
An acid ash is formed from phosphorus, chloride and sulfur, whereas alkalinity comes from sodium, potassium, calcium and magnesium.
Acid Ash Diet
A diet intended to promote acidification of urine, with emphasis on meat, fish, and eggs.
Alkaline Ash Diet
A diet consisting mainly of fruits, vegetables, and milk with little meat, fish, eggs, cheese, and cereals, that when catabolized leaves an alkaline residue to be excreted in the urine
The pH scale goes from 0 to 14, with 7 being neutral (water).
Below 7 is acid and above 7 is alkaline. PH is actually an exponential scale. Every unit change in pH equals a 10-fold increase.
The acidity of a sample with a pH of 6 is ten times greater than that of a sample with a pH of 7.
A difference of 2 units, from 7 to 5, would mean that the acidity is one hundred times greater, and so on.
NOTE: For example:
1. Coca-Cola being pH 2 is 100,000 times more acidic than water
2. Coffee with pH 4 is 1,000 times more acidic than water.
It is not a good idea to consume these kind of drinks at any time and especially when out of balance.