The pH scale
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Unit 8: Khan academy. The pH scale video. This also include the worked example video.
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11 Terms
What is the equation to find the pH of [H3O+]?
pH = -log [H3O+]
pH = -log [H+]
Draw the pH scale.
Label where it is considered acidic, neutral, basic
What is the relationship between [H3O+] and pH?
An increase in [H3O+] = decrease in pH
A decrease in [H3O+] = increase in pH
What is the equation to find the pH of [OH-]?
pH = -log [OH-]
What is the equation to find the pH of water?
pKw = -log [Kw]
What is another way to write [H3O+]?
[H+]
What is the chemical formula for hydroxide?
OH-
What is the chemical formula for hydronium?
H3O+
Write the equation that includes pH and pOH.
pH + pOH = 14.00
How would I solve for [H3O+] if I am only given pOH?
Use the route that includes pH + pOH = 14.
Use the pH + pOH = 14.00 to solve for pH
Take the found pH value and plug it into pH = -log [H3O+]
Plug in the values and rearrange the equation
Move the negative to the other side and take the log of both sides
How would I solve for [H3O+] if I am only given pOH?
Use the route that includes pOH = -log [OH-]
Plug the given pOH value into pOH = -log [OH-]
Isolate for [OH-]
Take the found [OH-] value and plug it into [OH-][H3O+] = 1.0 × 10-14
Solve for [H3O+]