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 2Kimrey3 January 2013
*pH Calculations
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*Homework Check*Chloric Acid*HClO4
*Nitric Acid*H2C2O4
*Phosphic Acid*HF*Hydroiodic Acid*HBr*Hydrochloric Acid*Hydrochloric Acid*Perchloric acid*Hydroiodic acid*Sulfic acid / Sulfuric acid*Hydrosulfic acid / Hydrosulfuric
acid*OMIT*Carbonic acid*Perbromic acid*Bromic acid*Acetic acid*OMIT*Hydrophosphic acid
*HF*HNO3
*HNO2
*H2CO3
*HMnO4
*H2Cr2O7
*H2SO3
*H2SO4
*HClO4
*HClO2
*HC2H3O2
*H3PO4
* 7-14*No, Bases aren’t sour* Salt + water*Acetic acid- food*H2SO4 - Battery Acid*NaOH- drano*Mg(OH)2 - antacid
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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 you need to memorize. *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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*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?