Get Ready! Materials 1.Pencil 2.Notebook Today’s Agenda 1.5-in-5 2.Acid & Base Notes 3.Lab 4.Exit Ticket 1.5-in-5 2.Acid & Base Notes 3.Lab 4.Exit Ticket

5-in-5 #29 ~ Review Describe the location of the metals, nonmetals and metalloids on the periodic table and include their properties.

Lesson Frame  Essential Question: How is pH used to classify solutions?  I will…  Use the pH scale to differentiate between acids and bases  By the end of this lesson I will be able to…  Test and place common household products on the pH scale based on their pH.

Acids and Bases & the pH Scale

What do you know about acids or bases?

 pH is a measure of how acidic or basic a solution is. The pH scale ranges from 0 to 14.  Acidic solutions have pH values below 7 A solution with a pH of 0 is very acidic (…more acidic than a pH of 6).  A solution with a pH of 7 is neutral Pure (distilled) water has a pH of 7. Base solutions have pH values above 7

What is an acid?  pH of less than 7  (Honors) An acid is a solution that has an excess of H 3 O + ions (hydronium ions)  (Honors) The more H + ions, the more acidic the solution.

Properties of an Acid  Tastes Sour  Corrosive  Means it breaks down certain substances – fabric, skin, paper

Common Examples of Acids  Acetic Acid - Vinegar  Citric Acid - lemons, limes, & oranges.  It is in many sour candies such as lemonhead & sour patch kids.  Hydrochloric acid - acid in your stomach that helps breakdown your food.

What is a base?  pH of greater than 7  Another word for a base is alkaline (alkalinity).  (Honors) A base is a solution that has an excess of OH - ions (hydroxide ions)

Properties of a Base  Feel Slippery  Taste Bitter  Corrosive

Common Examples of Bases  Soaps and other cleaning products  Baking soda  Bleach  Your blood is a slightly basic solution

What is a neutral pH?  pH of 7  A chemical solution which is neither acidic nor basic.  (Honors) Has an equal number of hydrogen and hydroxyl ions.

Properties of a Neutral  Tend to be harmless

Common Examples of Neutrals  Distilled Water

 pH is a measure of how acidic or basic a solution is. The pH scale ranges from 0 to 14.  Acidic solutions have pH values below 7 A solution with a pH of 0 is very acidic (…more acidic than a pH of 6).  A solution with a pH of 7 is neutral Pure (distilled) water has a pH of 7. Base solutions have pH values above 7

pH Scale X10 A change of 1 pH unit represents a tenfold change in the acidity of the solution. For example, if one solution has a pH of 3 and a second solution has a pH of 4, the first solution is not twice as acidic as the second…it is 10 times more acidic.

What do you think??  Prediction: If we mix an acid and a base together what do you think will happen to the overall pH of the solution??

Acids & Bases Lab

Exit Ticket  Which solution is more acidic? Explain why.  Solution A – pH 3  Solution B – pH 1  Solution C – pH 10  Solution D – pH 7

Acid – Base Reactions  A reaction between an acid and a base is called neutralization which forms a salt.  An acid-base mixture is not as acidic or basic as the individual starting solutions.