Why is bottled water neutral

The word criterion is used of a principle or thing we choose to use as a standard when judging a situation. The plural or criterion is criteria, not criterions.  

The labels of many cosmetic products, as well as those on most bottles of drinking water, emphasize how the product is neutral , implying how it is neither acidic nor alkaline. This stipulation is deemed to show how healthy the water is. But how do they know And, furthermore, what is their criterion for testing  

A better way of defining neutral is to say equal numbers of protons and hydroxide ions reside in solution (both types of ion being solvated). How does this situation arise Autoprotolysis, as mentioned above, represents the //-production of protons, which is achieved by the splitting of water according to Equation (6.2). It is clear from Equation (6.2) how the consequence of such auto-protolytic splitting is a solution with equal numbers of protons and hydroxide ions. 

When water contains no dissolved solutes, the concentrations of the solvated protons and the hydroxide ions are equal. Accordingly, from our definition of neutral above, we see why pure water should always be neutral, since [H30+(aq)] = [OH (aq)]. 

As with all physicochemical processes, the extent of Equation (6.2) may be quantified by an equilibrium constant K. We call it the autoprotolysis constant, as defined by 

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