Warm Up
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Transcript of Warm Up
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*Warm Up
*Name the following acids:
*HI
*HNO3
*HCl
*Write the formula for the following acids:
*Hydrofluoric Acid
*Nitrous Acid
*Hydrobromic acid
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Unit 10, Day 2
Kimrey
17 May 2013
*pH Calculations
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*Objectives
*Identify strong and weak acids
*Calculate the pH and pOH of an acid given a concentration.
*Determine the concentration of an acid given a pH or pOH.
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*Strong Acids and Weak Acids
*There are two strengths of acids: strong and weak.
*Strong acids completely dissociate (break up) in water.
*Weak acids do not completely dissociate.
*There are 6 strong acids.
*HCl
*HBr
*HI
*H2SO4
*HNO3
*HClO4
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*pH
*pH is a logarithmic scale that measures the concentration of the [H+] ion in solution.
*Goes from 0 -14
* 0 - 6.99 is acidic
*14 – 7.01 is basic
*pH = -log[H+]
*[H+]=10-pH
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*Logs and anti logs…oh my!
*Don’t freak over logs and anti-logs, your calculator does them for you!
*Ex. Find the pH of a HCl solution with a H+ concentration of 1 x 10-6.
*pH = -log[H+]
*pH = 6
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*Hydronium
*When acids break up, the concentration of hydrogen is sometimes explained by using hydronium
*Hydronium is H3O
*Water + Hydrogen
*Just do math the same way!
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*Example
*Find the pH of a 0.03 M solution of HBr.
*pH = -log[H+]
*pH = 1.5
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*Example
*What is the concentration of a HCl solution that has a pH of 3?
*[H+]=10-pH
*[H+] = .001M
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*pOH
*Same as pH, but opposite.
*Goes from 0 -14
* 0 - 6.99 is basic
*14 – 7.01 is acidic
*pOH = -log[OH-]
*[OH-]=10-pOH
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*Example
*Calculate the pOH for a solution of NaOH with a concentration of 1 x 10-4 M.
*pOH = -log[OH-]
*pOH = 4
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*Example
*Calculate the pOH for a solution of KOH with a concentration of 0.45 M.
*pOH = -log[OH-]
*pOH = .35
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*Example
*What is the concentration of a solution the has a pOH of 13.5?
*[OH-] = 10-pOH
*[OH-] = 3.16 x 10 -14 M
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*pH and pOH
*Remember that both the pH and pOH scale go from 0-14.
*As the concentration of [H+] or [OH-] goes up the other must go down.
*These two relationships allows us to assume that:
*pH + pOH = 14
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*Example
*What is the pH of a solution that is found to have a pOH of 10?
*pH = 4
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*Example
*What is the pH of a .067 M solution of LiOH?
*pOH = 1.17
*pH = 12.8
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*Example
*What is the pOH of a 0.0056 M solution of HCl?
*pH = 2.25
*pOH = 11.75
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*Exit Card
*What is the pH of a solution HI with a concentration of .0089 M?
*What is the concentration of a strong acid with a pH of 3.45?
*What is the pH of a solution of a NaOH with a concentration of 5.67 x 10-4 M?