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 answer is b. dilution

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