48 Mixing an Acid and a Base. LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the SEPUP course.

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48 Mixing an Acid and a Base

LIMITED LICENSE TO MODIFY. These PowerPoint® slides may be modified only by teachers currently teaching the SEPUP course to customize the unit to match their students’ learning levels or to insert additional teaching aides. Modified slides may be used only by the modifying teacher in his or her classroom, or shared with other teachers of SEPUP within the teacher’s school district, with these same restrictions. Modified slides may not be taken out of the classroom or distributed to any non-student person or organization. Except for use with students in the classroom, modified slides may not be published in printed or electronic form, including posting on the Internet. Only text may be modified: photographs and illustrations on the slides may not be modified in any way except to change their size. DISCLAIMER OF WARRANTY. THE REGENTS OF THE UNIVERSITY OF CALIFORNIA (“University”) MAKE NO REPRESENTATIONS OR WARRANTIES, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. University will not be liable for any costs, damages, fees or other liability, nor for any direct, indirect, special, incidental or consequential damages (including lost profits) with respect to any claims by the purchaser or user of SEPUP or any third party on account of or arising from the use or modifications to the slides. Client acknowledges and accepts that University services are provided on an as-is basis. Copyright © 2015 The Regents of the University of California. All rights reserved. Header photo: Sam Howzit | Flickr Creative Commons Slide Design: Shaun Wegscheid | Fonts: Arial, Kalinga Title slide photo: Jean Scheijen | FreeImages.com

48 Mixing an Acid and a Base Key Vocabulary acid base concentration model molecule neutral neutralize, neutralization pH

48 Mixing an Acid and a Base What do you predict will happen to pH when an acid and a base are mixed together? Record your answer in your notebook.

48 Mixing an Acid and a Base Read the introduction and look for key ideas

48 Mixing an Acid and a Base What happens when you mix an acid and a base? Orange juice is acidic.

48 Mixing an Acid and a Base Complete procedure Part A: Mixing an Acid and a Base: Qualitative Observations. Record your data in your notebook.

48 Mixing an Acid and a Base What happens to the concentration of ions in the mixture as it becomes more basic? Discuss your thoughts with the class.

48 Mixing an Acid and a Base What happens as the hydroxide ion concentration continues to increase as more base is added? Discuss your thoughts with the class.

48 Mixing an Acid and a Base Complete procedure Part B: Mixing an Acid and a Base: Quantitative Observations. Record your results in your notebook.

48 Mixing an Acid and a Base Class results

48 Mixing an Acid and a Base What are possible reasons for the different results for each neutralization? Share your thoughts with the class.

48 Mixing an Acid and a Base Analysis question 1 What happens as you add an acid to a basic solution or add a base to an acidic solution?

48 Mixing an Acid and a Base What do you think is happening to make the solutions become neutral? Do you think one drop of the acid you used and one drop of the base have equal numbers of particles? What do you think happened to the acid and base particles when they were mixed? Discuss your thoughts with the class.

48 Mixing an Acid and a Base Analysis question 2 Which solution seems more powerful in this investigation, the acidic or the basic? Explain your answer.

48 Mixing an Acid and a Base Analysis question 3 Based on what you know so far, which do you think is a better way of neutralizing an acid: diluting it with water, or adding a base? Explain your answer.

48 Mixing an Acid and a Base Analysis question 4 Given two solutions, how might you determine: a.whether these solutions are acidic or basic? b.which is more acidic or basic?

48 Mixing an Acid and a Base What happens when you mix an acid and a base?

48 Mixing an Acid and a Base Key vocabulary definitions Acid - A material that acts as if it were the opposite of a base in a reaction. Acids taste sour and are usually very corrosive (destructive to metal or flesh). A strong acid has a pH below 1 on the pH scale. Some strong acids are nitric, sulfuric, and hydrochloric acids.

48 Mixing an Acid and a Base Key vocabulary definitions Base - A substance that acts in an opposite way to an acid in a reaction. Bases taste bitter and are usually corrosive. Some strong bases include sodium hydroxide (lye) and chlorine bleach. Bases have a pH higher than 7.

48 Mixing an Acid and a Base Key vocabulary definitions Concentration - The quantity of a particular type of matter that exists in a unit volume. The more of that type of matter present per unit volume, the more concentrated the substance. In a solution, it is the amount of solute per unit of solution; therefore, the more solute per solvent that is present, the more concentrated the solution.

48 Mixing an Acid and a Base Key vocabulary definition Model - Something that is used to describe a larger or smaller object; a description of an event or object that accounts for all its properties. Molecule - The smallest particle of an element or compound that displays the properties of the substance in quantity.

48 Mixing an Acid and a Base Key vocabulary definitions Neutral - A solution that has a pH of 7. It is neither an acid or a base. Neutralization - A balance of acid and base so that their particles (molecules) are present in equal amounts. The products of neutralization are water and a salt. When an acid is neutralized by a base, the resulting solution is said to be neutral and has a pH of 7.

48 Mixing an Acid and a Base Key vocabulary definitions pH - A way of describing the acidic or basic strength of a solution. The pH value of a solution is a number on a scale from 0 to 14. A pH value of 0–1 indicates a strong acid. A pH value of 12– 14 indicates a strong base. A pH value of 7 indicates a neutral solution.