In water and neutral solutions ... is diluted with water the concentration of H + ions decreases and the pH of the solution increases towards 7. To make the pH change by 1, a tenfold dilution ...

When pure water is dropped into a solution of universal indicator, the indicator stays green. This indicates a pH value of 7 and tells us that water is neither alkaline or acid, but neutral.

How did Earth transform from a hostile, acidic ocean world to one that nurtured life? Scientists at Yale and in Singapore ...

Their model estimates that it took Earth 500 million years to neutralize ocean acidity enough to support life. While pockets ...