Acid-Base - Oakland Schools

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Acid-Base Concepts Activity #5 – Acids & Bases Questions to be investigated How can we find out the concentration of an acid or base using a titration? Objectives Students will use a titration to perform a neutralization reaction. (C5.7B) Materials Goggles, Aprons 1 - 100 ml Burette Burette Clamp 1 M NaOH 1 M HCl 1 M H2SO4 1 M K(OH) Distilled water 50 ml Beaker 250 ml beaker Bromthymol Blue Hydrion (pH) paper Masking tape Funnel Ring stand . Safety Concerns Safety goggles should be worn at all times. Acids and bases can be irritating to eyes and skin. Burettes are expensive and should be used with care. Real-World Connections Many companies, hospitals, universities etc. use acid base titrations to analyze the presence of compounds in various consumer products. Sources The website below is an online virtual titration lab that may be used to practice prior to doing the lab in class. http://lrs.ed.uiuc.edu/students/mihyewon/chemlab_instruction.html Acid and Base lab used with permission from Craig Riesen, Clarenceville High School. 28
Procedure/Description of Lesson Purpose: To investigate Acid-Base Titration using various indicators. Discussion: Chemists used acid-base titration to determine the composition of acids and bases in solution. Acid-base titration is used in nearly every laboratory, including universities, power plants, candy factories, hospitals, poison & emergency medical treatment facilities and even breweries in order to analyze mixtures of compounds in solutions. It is one of the most precise methods of chemical analysis. To produce “Coke” or “Pepsi” or a “Snickers Bar” requires consistent precision in terms of the ingredients used. In this lab we will use neutralization reactions to understand acid-base theory. Acids and bases ionize readily, making them reactive compounds. When a strong acid and a strong base are mixed together, however, the reactivity is neutralized because salt and water are produced. Salt and water are non-reactive compounds. Neutralization is defined by the following equation: Acid + Base Salt + Water HCl (aq) + NaOH (aq) NaCl (aq) + H(OH) (l) Notice that water H(OH) is produced as the H + ion from the acid combines with the OH - ion from the base. Salt (NaCl) is produced as the Na + ion from the acid combines with the Cl - ion from the base. During this particular neutralization the following Net Ionic Equation took place: H + + OH - H(OH) (l) Spectator Ions: Na + , Cl - Acid-base titrations use indicators. An indicator is selected on the basis of color changes they produce at or near the point at which equal quantities of an acid and a base have been added (this is called the equivalence point). When titrating, however, the end point is often a more important pH value. The end point shows the point at which a change in the indicator color reveals that neutralization is complete. At the end point, one drop of an acid or a base can produce a color change. 29
Page 1 and 2: Oakland Schools Chemistry Resource
Page 3 and 4: Instructional Background Informatio
Page 5 and 6: The ion product constant of water m
Page 7 and 8: Terms and Concepts Acid Rain Acid/B
Page 9 and 10: Teacher Notes Prior to doing this l
Page 11 and 12: Data Table: Solution # pH # from te
Page 13 and 14: Questions to be investigated Object
Page 15 and 16: Safety Concerns 1. Goggles should b
Page 17: Acid-Base Concepts Activity #3 - Ac
Page 21 and 22: anging from pH of 1 (strongest acid
Page 23 and 24: Calculations and Data 1. Chart of s
Page 25 and 26: Solution Preparation of 1 L of 0.00
Page 27: Answers to Conclusions and Question
Page 31 and 32: Procedures 1. Obtain goggles and ap
Page 33 and 34: Conclusions and Questions 1. How di
Page 35 and 36: Conclusions and Questions 1. How di
Page 37 and 38: Answers to Conclusions and Question
Page 39 and 40: Acid-Base Concepts Activity #6 - Ac
Page 41 and 42: Materials distilled water Buffered
Page 43 and 44: Source: Acid Rain Experiments Envir
Page 45: Authentic Assessment Items Part I.

Acid-Base - Oakland Schools

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