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Acids and Bases Chemistry Lowell High School 2006-2007 2/20/07 to …
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Agenda FYI’s Reading Report Acids/Bases Preamble 8 Tuesday, February 20, 2007
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FYI RLog 16 TODAY Quiz(chap 15) 2/23 Friday QP 16 (1-49 odd) 3/2 Friday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Tuesday, February 20, 2007
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Reading Log Report On your whiteboard, construct a reading report for chapter 16 (10 min) Include 3 bullet points and cite section # InterconnectedInteresting IncomprehensibleClarification Tuesday, February 20, 2007 Important
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Acids/Bases Acid = produces hydrogen (donor) Base = accepts hydrogen (acceptor) Acidity and Basicity are measured using the pH/pOH scales (range 0-14) pH = – log [H + ] pOH = – log [OH - ] pOH + pH = 14 [H + ][OH - ] = 1 x 10 -14 Tuesday, February 20, 2007
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Preamble 8 Determine the pH of 100.0 mL of a 1.00 M HCl solution. Suppose you double the volume of the solution by adding water. What is the new pH? You double the volume once more with water. What is the new pH? If you continue to add more water, what is the maximum pH that can be reached? Explain your answer. Tuesday, February 20, 2007
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Agenda FYI’s Acid/Base Preamble 8 Water’s Equilibrium Neutralization Preamble 9 Wednesday, February 21, 2007
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FYI Quiz(chap 15) 2/23 Friday QP 16 (1-49 odd) 3/2 Friday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Wednesday, February 21, 2007
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Acids/Bases Acid = produces hydrogen (donor) Base = accepts hydrogen (acceptor) Acidity and Basicity are measured using the pH/pOH scales (range 0-14) pH = – log [H + ] pOH = – log [OH - ] pOH + pH = 14 [H + ][OH - ] = 1 x 10 -14 Wednesday, February 21, 2007
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Preamble 8 Determine the pH of 100.0 mL of a 1.00 M HCl solution. Suppose you double the volume of the solution by adding water. What is the new pH? You double the volume once more with water. What is the new pH? If you continue to add more water, what is the maximum pH that can be reached? Explain your answer. Wednesday, February 21, 2007
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Water’s Equilibrium Water is ALWAYS in equilibrium with itself according to the following equation: 2H 2 O H 3 O + + OH - The equilibrium constant for this reaction is called K w = 1.0 x 10 -14 K w = ion product constant Wednesday, February 21, 2007
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Neutralization When an acid and base are put together, they will neutralize each other. If the acid and base contain H and OH, the reaction will form water. H 3 O + + OH - 2H 2 O Wednesday, February 21, 2007
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Preamble 9 A Lowell student is trying to neutralize 90.0 mL of a 0.400 M solution of the strong base, Sodium hydroxide so he can put it down the drain. He adds 30.0 mL of a 1.75 M solution of nitric acid. He then adds 240.0 mL of water. Will the resulting solution be neutral? What will the [H + ] and pH be? What is the [OH - ] and pOH? Would the solution turn litmus pink? Wednesday, February 21, 2007
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Agenda FYI’s Conjugate Acid/Base Indicators Thursday, February 22, 2007
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FYI Quiz(chap 15) 2/23 Friday QP 16 (1-49 odd) 3/2 Friday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Thursday, February 22, 2007
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Conjugate Acid/Base Pairs To find the conjugate base of an acid, remove one H To find the conjugate acid of a base, add one H Find the conjugate acid/base for the following: H 2 SO 4, C 2 H 3 O 2 -, NH 3, HBr, NaOH Thursday, February 22, 2007
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Indicators Indicators INDICATE pH via color As the pH of the solution changes, the indicator molecule reacts to the presence of H + by rearranging itself and forming a different color. There is no “ standard ” color for each pH. Red is not always acid, blue is not always base Thursday, February 22, 2007
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Agenda FYI’s Quiz Conjugate Acid/Base Indicator Lab Friday, February 23, 2007
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FYI Quiz(chap 15) TODAY QP 16 (1-49 odd) 3/2 Friday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Friday, February 23, 2007
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Conjugate Acid/Base Pairs To find the conjugate base of an acid, remove one H To find the conjugate acid of a base, add one H Find the conjugate acid/base for the following: H 2 SO 4, C 2 H 3 O 2 -, NH 3, HBr, NaOH Friday, February 23, 2007
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Indicator Lab Questions 1. Draw a color line for each of the indicators in the lab (one end = acidic, other = basic) 2.Compare the color lines to the ones in the book on page 520. 3.Why did the Bromothymol Blue solution turn yellow? What was the reaction? 4. What have you learned about indicators? What were some of the differences between the indicators? Friday, February 23, 2007
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Agenda FYI’s Indicator Lab Finish (10 min) Garden Project Buffers Normality Preamble 10 Monday, February 26, 2007
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FYI QP 16 (1-49 odd) 3/2 Friday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Monday, February 26, 2007
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Acid/Base Lab Questions: (I saw/ I thought) 1. Draw a color line for each of the indicators in the lab (one end = acidic, other = basic) 2. Compare the color lines to the ones in the book on page 520. 3. Why did the Bromothymol Blue solution turn yellow? What was the reaction? 4. What have you learned about indicators? What were some of the differences between the indicators? Monday, February 26, 2007
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Garden Project Garden center informational brochure Tri-fold, HANDWRITTEN/DRAWN 4 parts that must be included “ Documents A-D ” are there for your reference. You may also use web sources if you need more help Suggestions: Lay out a mock brochure on notebook paper before making a final version on nice paper Use pens/markers instead of pencil for impact Monday, February 26, 2007
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Buffers A buffer is a mixture of a weak acid and its conjugate base The conjugate base is typically balanced with the presence of an alkali or alkaline earth metal (Groups 1/2) If a base is added, it will react with the weak acid If an acid is added, it will react with the conjugate base Monday, February 26, 2007
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Strong vs. Weak Acids Weak acids: HNO 2 HF HC 2 H 3 O 2 HCN You will need to memorize these lists (suggestion, memorize the strong, all others are weak) Monday, February 26, 2007 Strong acids: HCl HBr HI HNO 3 H 2 SO 4
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Normality When an acid or a base is dissolved in water, it produces a certain amount of H + or OH - Normality is the concentration of H + or OH - in the solution Often, pH = – log N (instead of –log M) Equivalent = amount that provides 1 mol of acid or base Monday, February 26, 2007
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Preamble 10 Decide which of the following are strong vs. weak acids and write out their conjugate bases Then, if they are weak acids, write out the reaction of a buffered solution with 1) HCl and 2) NaOH HNO 3 HF HClO 4 CH 3 COOH HClH 2 S Monday, February 26, 2007
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Agenda FYI’s Titration Titration Lab Tuesday, February 27, 2007
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FYI QP 16 (1-49 odd) 3/2 Friday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Tuesday, February 27, 2007
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Preamble 10 Decide which of the following are strong vs. weak acids and write out their conjugate bases Then, if they are weak acids, write out the reaction of a buffered solution with 1) HCl and 2) NaOH HNO 3 HF HClO 4 CH 3 COOH HClH 2 S Tuesday, February 27, 2007
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Titration Titration is a process that determines the amount/concentration of an unknown substance in a solution The analyte = the unknown (analyzed) The titrant = substance reacting with analyte (titrating the analyte) In the Sailin ’ the High C ’ s lab, Vitamin C = analyte and iodine = titrant Tuesday, February 27, 2007
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Titration Titration between a strong acid and a strong base involves neutralization H + (from acid) + OH - (from base) H 2 O In this reaction, the titration is finished when the pH = 7 The end = the equivalence point Tuesday, February 27, 2007
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Titration Lab You will be given a sample with an unknown concentration of sulfuric acid (analyte). Using phenolphthalein as an indicator and sodium hydroxide as your titrant, determine the original concentration of the sulfuric acid solution. You will be given a buret, distilled water, flasks, and graduated cylinders Design a procedure for your experiment Tuesday, February 27, 2007
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Agenda FYI’s Extra Credit Titration Lab Preamble 11 Thursday, March 1, 2007
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FYI QP 16 (1-49 odd) TOMORROW Acid/Base Lab 3/5 Monday Garden Project3/5 Monday (look online) RLog 10/14 3/12 Monday Thursday, March 1, 2007
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Extra Credit (bring 1 or 2) Gloves (50) M or L Medicine cups (5) 1 pack Food coloring 1 box baking soda Distilled Water (1 Gallon) 1 25 lb bag of salt (Costco) 1 pack of balloons (12”) (20-25/pack) 1 hour of work after school for Ms. Rotter Bring these supplies M-F of next week, they will apply to this marking period 1 10lb bag of sugar Straws (100) box of Alka-Seltzer Bottle of Borax 1 large match box Sponges Thursday, March 1, 2007
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Acid/Base Titration Writeup You will be doing a formal write-up for this lab. The sections that should be included are on the website. In your lab notebook should simply be your data The write-up (to be peer reviewed) will be due on Monday. Make sure there is a copy for each person in your team. Thursday, March 1, 2007
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Acid/Base Titration Determine the concentration of the original sulfuric acid solution What was the reaction that took place in your beaker? What are indications that you are approaching an endpoint? What would be the difference if you had hydrochloric acid instead of sulfuric acid? What changes would you have seen? Be specific with numbers. Design an experiment to determine the concentration of hydroxide in an unknown sample. Thursday, March 1, 2007
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Preamble 11 What ideas do you have about what happens when ice is added to water? What happens to both the water and the ice? Use terms such as cooling, heating, melting, freezing, molecular motion/speed and energy. Draw a series of pictures to represent what happens when ice melts into water. Label as necessary. Thursday, March 1, 2007
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Agenda FYI’s Extra Credit QP 16 Review Friday, March 2, 2007
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FYI QP 16 (1-49 odd) TODAY Acid/Base Lab 3/5 Monday Garden Project 3/5 Monday (look online) RLog 10/14 3/12 Monday QP 10 (1-35 odd) 3/19 Monday QP 14 (1-41 odd) 3/26 Monday RLog 19 3/29 Thursday Friday, March 2, 2007
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Extra Credit (bring 1 or 2) Gloves (50) M or L Distilled Water (1 Gallon) Medicine cups (5) 1 pack Food coloring 1 box baking soda 1 25 lb bag of salt (Costco) Sponges 1 pack of balloons (12”) (20-25/pack) 1 hour of work after school for Ms. Rotter Bring these supplies M-F of next week, they will apply to this marking period Friday, March 2, 2007 1 10lb bag of sugar Straws (100) box of Alka-Seltzer Bottle of Borax 1 large match box
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QP 16 (8 min) On your whiteboard, put the following questions from QP 16 Carbon Cavaliers – # 7 + 9 Periodic Pros – # 15 + 17 Avogadro Aces – # 21 + 29 Kinetic Kids – # 23 + 25 Equilibrium Experts – # 33 Reaction Radicals – # 47 + 49 Solubility Stars – # 43 + 45 Valance Veterans – # 39 + 41 Friday, March 2, 2007
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Acid/Base Titration Writeup You will be doing a formal write-up for this lab. The sections that should be included are on the website. In your lab notebook should simply be your data (PLUS FIRST ANALYSIS QUESTION) The write-up (to be peer reviewed) will be due on Monday. Make sure there is a copy for each person in your team. Friday, March 2, 2007
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