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Acids, Bases, and Solutions

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Presentation on theme: "Acids, Bases, and Solutions"— Presentation transcript:

1 Acids, Bases, and Solutions
Chapter 7

2 What is a Solution?

3 Same properties throughout Contains a solvent and a solute
Solutions Same properties throughout Contains a solvent and a solute

4 Solvent Does the Dissolving Water = Liquid

5 Solute The stuff that is dissolved Sugar

6 Kool-Aid Solvent = Water Solute = Sugar

7 Water is referred to as the “universal Solvent”

8 Water dissolves almost anything

9 Concentration How much solute (dissolved stuff)

10 Dilute Weak Not a lot of solute (dissolved stuff)

11 Concentrated Strong A lot of solute (dissolved stuff)

12 Measuring Concentration
Amount of Solute Amount of Solvent X 100

13 Example A solution contains 12 g of solute dissolved in 36 g of solution. What is its concentration?

14 Answer: 10% 12 g 36 g = .33 x 100 .33 = 33%

15 Example What is the concentration of a solutions that contains 45 grams of sugar in 500 grams of solution?

16 Answer: 9% 45 g 500 g = .09 x 100 .09 = 9%

17 Example How much sugar is dissolved in 500 grams of a solution if the solution is 70 percent sugar by mass?

18 Answer: 350g X 500 g 70%= .7 (500) = x X = 350g

19 Solubility A measure of how much solute (dissolved stuff) can dissolve

20 Unsaturated Solution Weak, Dilute Very little solute is added
Add more sugar it will dissolve

21 Saturated Solution Perfect Amount No more solute will dissolve
If you add more it will settle to the bottom

22 Supersaturated Add so much solute that it begins to pile up on the bottom of the container

23 Acids and Bases

24 Indicators Compounds that change color when it contacts an acid or a base

25 Properties of Acids Sour taste Reacts with metals (corrosive)
Turns litmus paper red

26 Properties of Bases Bitter Taste Slippery Feel Turns Litmus paper Blue


28 Acids Produce Hydrogen Ions (H+) in water

29 Bases Produce Hydroxide ions (OH-) ions in water

30 Strengths of Acids and Bases
The pH scale

31 The pH scale Range of numbers from 1-14

32 Ph < 7 ACIDIC H+ ions present
The lower the number the stronger the acid (more H+ ions)

33 pH = 7 Neutral Not acidic or basic H+ = OH- ions

34 pH > 7 BASIC OH- ions present The higher the number the more basic

35 Neutralization A reaction between an acid and a base Salt and water produced

36 Neutralization

37 Check for Understanding

38 pH 1, pH 3 or pH 7 ? Which contains the highest concentration of Hydrogen ions? pH of 1

39 pH of 3 pH of 6 or pH of 3 Which is stronger?
Which contains more H+ ions? pH of 3

40 pH of 14 pH 10 or pH 14 Which is a stronger base?
Which has more OH- ions? pH of 14


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