why giving 1 to 14 numbers for ph scale in chemistry?

Answer 1

It has to do with the definition of pH, which is negative one times the base ten log of the concentration of H+ ions in a solution. The dissociation constant of water happens to be 1.011 x 10^-14, yielding a pH of 6.99, or experimentally 7. It is essentially a coincidence. If the dissociation constant of water hadn't been near a power of ten, there would probably be a normalization constant involved, and the scale could be centered on zero or any other arbitrary value.

Answer 2

pH, range of numbers expressing the relative acidity or alkalinity of a solution. In general, pH values range from 0 to 14. The pH of a neutral solution, i.e., one which is neither acidic nor alkaline, is 7. Acidic solutions have pH values below 7; alkaline, or basic, solutions have pH values above 7. A pH value provides a measure of the hydrogen ion concentration of a solution. In pure water the concentration of hydrogen ions is equal to 0.0000001, or 10−7, moles per liter. (A mole is the amount of a substance, expressed in grams, that is equal to the molecular weight, or formula weight, of the substance.) When an acid is added to pure water, the hydrogen ion concentration increases above this level. When an alkaline substance, or base, is added to pure water, the hydrogen ion concentration decreases below this level. Once the concentration is determined, the pH value is found by taking the exponent used in expressing this concentration and reversing its sign. This is expressed as pH=−log10[H+].

Answer 3

pH is defined as log 1/ [H+] .

As the concentration of ions [H+] increases pH lowers.

However, these concentrations are so low, that the human mind can not easily imagine the value of pH> 5. So the expression of the concentration of H+ has pH is psychologically easier to understand

Answer 4

The human mind can only understand things if they have been categorised (tagged) we need to do that. It is like numbers - onlu ruins, symbols, of something we know to mean something. There are more than 38 elements, science still needs to define, and fins, the other three.