Bell Work! Timmy used litmus paper to test an unknown substance. He could tell that the substance was a clear liquid and it seemed to be bubbling. He also knew that he had seen it before so it must be something pretty familiar. When he used the indicator during his test, he saw that the red litmus paper turned blue. His lab partner predicted that the unknown substance was Sprite (because of the clear fizzing). Timmy disagreed…but why?

Preparing for TCAP… SPI 0807.9.1: All About Atoms The smallest part of an atom is the __________. electron SPI 0807.9.9: All About the Periodic Table How many protons does an element have with an atomic number of 5 and a mass number of 10.9? 5 SPI 0807.9.12: Acids and Bases Acids turn red litmus paper… red

If something had a pH of 2, it would be… Let’s Race! If something had a pH of 2, it would be… ACID

Let’s Race! OH- represents… BASE

The name for H+ (or H3O+) is… Let’s Race! The name for H+ (or H3O+) is… HYDRONIUM ION

Let’s Race! Water has a pH of… 7

Let’s Race! Sour Taste ACID

Let’s Race! Slippery Feel BASE

Let’s Race! pH greater than 7 BASE

Let’s Race! Reacts with metal ACID

Let’s Race! Bitter taste BASE

Let’s Race! Has a pH of 8.5 BASE

The pH Scale Chapter 14

Strengths of Acids and Bases Acids and bases can be strong or weak. Strength vs. Concentration + = NEUTRAL ACID BASE

Strong vs. Weak Acids: STRONG ACID—all the molecules break apart and produce H+ ions H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ H+ WEAK ACID—a few molecules break apart and form H+ ions

Examples of Acids: STRONG: sulfuric acid, hydrochloric acid WEAK: acetic acid, citric acid, carbonic acid

Strong vs. Weak Bases: STRONG BASE—all the molecules break apart and produce OH- ions WEAK BASE—few of the molecules break apart and form OH- ions

The pH Scale: The pH of a solution is a measure of the hydronium ion concentration in the solution. (Or how many H+ there are…) Remember! Acid = less than 7 Neutral = 7 Base = more than 7

Today’s Assignment