The pH of a solution is 2.55. What is the [H3O+]?

pH = 4

Explanation:

To calculate the pH of a solution, use the equation p H = − log [ H 3 O + ] Since we are given the hydronium ion ( H 3 O + ) concentration of the solution, we can plug this value into the formula. p H = − log [ 1.00 × 10 − 4 M ]  p H = 4 The pH of this solution is 4. Added notes: p H = p H 3 O +  because hydrogen ions attach to water molecules for form hydronium ions. Some other key things to remember for pH calculations include: pH + pOH = 14 pH = -log[ H + ]  pOH = -log[ O H − ] [ H + ] = 10 − p H  [ O H − ] = 10 − p O H

  the   balanced   equation   for   reaction of   ca metal   with   o2 to   produce   cao   is as below

2 ca+ o2→ 2 cao2

  explanation

the reaction is   balanced     since the   number of atoms   in reactant side is   equal to   number of atoms   in   product side.   for   example   they   are 2   atom of   ca in   reactant   side   and   2   atoms of ca   in   the product side.

  the   process   is a   meet the   requirement   of   redox   reaction because :     calcium   is   oxidized   from   oxidation state 0   to 2+   while   oxygen   is reduced from   oxidation   state   0   to 2-