The larger the ph scale value, the:

higher the concentration of h3o+ ions

lower the concentration of h3o+ ions

lower the concentration of oh− ions

more acidic the solution

Here is your answer

The larger the pH scale value, the:

lower the concentration of H3O+(hydronium ions ).

This is because

pH value is inversely proportional to concentration of H3O+ ions.

More pH value means the solution is more basic, so OH- ions concentration is more.

HOPE IT IS USEFUL

2h2o2--> 2h2o + o2

this reaction is of the spontaneous decomposition of hydrogen peroxide down into water and oxygen.

add 2 molecules of hydrogen peroxide and 2 molecules of water. since oxygen is naturally diatomic, the total number of atoms of each element is now the same on both sides of the equation so it is balanced.

this may not be entirely correct but let me know.