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Solutions for Acids and Bases Review

Solutions for Acids and Bases Review

Assessment

Presentation

•

Science

•

8th Grade

•

Hard

Created by

Joseph Anderson

FREE Resource

32 Slides • 22 Questions

1

Acids, Bases and pH Overview

Ms. Bev Taylor

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Multiple Choice

Many cleaning solutions are bases. Which of the following is a property of most bases?
1
feels slippery
2
white color
3
can only be liquid
4
tastes sour

13

Multiple Choice

Many cleaning solutions are bases. Which of the following is a property of most bases?
1
feels slippery
2
white color
3
can only be liquid
4
tastes sour

14

Multiple Choice

Soap is a weak base.  What is true about the taste of bases?
1
they taste sour
2
they taste sweet
3
they taste bitter
4
they taste salty

15

Multiple Choice

Soap is a weak base.  What is true about the taste of bases?
1
they taste sour
2
they taste sweet
3
they taste bitter
4
they taste salty

16

Multiple Choice

When dissolved in water, bases produce:
1
acids
2
salts
3
hydrogen ions
4
hydroxide ions

17

Multiple Choice

When dissolved in water, bases produce:
1
acids
2
salts
3
hydrogen ions
4
hydroxide ions

18

Multiple Choice

Which of these solutions is an acid?
1
Dish Soap: pH of 12
2
Tomato Soup: pH of 4
3
Baking Soda: pH of 9
4
Drain Cleaner: pH of 14

19

Multiple Choice

Which of these solutions is an acid?
1
Dish Soap: pH of 12
2
Tomato Soup: pH of 4
3
Baking Soda: pH of 9
4
Drain Cleaner: pH of 14

20

Multiple Choice

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

1

acid pH less than 7

2

acid pH greater than 7

3

base pH less than 7

4

base pH greater than 7

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Multiple Choice

Which of the following word pairs correctly completes the sentence below?

_______ are corrosive substances characterized as having a strong smell, a sour taste, and a _______.

1

acid pH less than 7

2

acid pH greater than 7

3

base pH less than 7

4

base pH greater than 7

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Multiple Choice

What would be considered the weakest base?

1

8

2

7.8

3

11.6

4

14

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Multiple Choice

What would be considered the weakest base?

1

8

2

7.8

3

11.6

4

14

30

Multiple Choice

Stronger acids have a pH closer to...

1

7

2

14

3

0

4

9

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Multiple Choice

Stronger acids have a pH closer to...

1

7

2

14

3

0

4

9

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Multiple Choice

Weaker bases have a pH closer to...

1

8

2

14

3

0

4

4

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Multiple Choice

Weaker bases have a pH closer to...

1

8

2

14

3

0

4

4

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Multiple Choice

Which of the following is true about acids and bases?

1

The lower the pH #, the stronger the acid

2

the higher the pH #, the stronger the acid

3

The lower the pH #, the more neutral the acid

4

The higher the pH #, the weaker the base

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Open Ended

What does a chemical equation tell you?

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Fill in the Blank

The _______ ________ describes the molar ratio at which the reaction will proceed.

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Multiple Choice

Can we use mole ratios to calculate how much product is produced from a known amount of reactant?

1

Yes

2

No

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Multiple Choice

What is Avogadro's Number?

1

6.0 x10^23

2

6.0x10^24

3

1023 x 10^6

4

8675309

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Concentration

  • measure of the amount of solute in a given amount of solvent or solution

  • 2 ways to measure

  • molarity- mol/L of solution

  • molality- mol/ g of solvent

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Molarity

  • number of moles of solute in one liter of solution

  • How to make

  • 1. Determine desired molarity i.e. .5 M, 1 M

  • 2. determine the mass needed by converting mol to gram

  • 3. dissolve in less solvent than 1 L

  • 4. Bring total solution to 1 L

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When calculating Molarity remember:

n of solute / L solution

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Fill in the Blank

If there is 0.09 mol NaCl dissolved in 0.80 L of solution, what is the molarity?

(round the answer to two decimal places)

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If you did not get the correct answer on that problem, take a look at the solution here.

Do you see what you might have done wrong?

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We are not always dealing with solids when we make solutions in the chemistry lab.

Sometime we have liquid reagents.

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Liquid Reagents

When we are mixing chemicals that involve only liquids, we must use this equation to solve for molarity or volume.

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Example: I have concentrated HCl in the storage room

  • Concentrated HCl is 12 M

  • I want to use 0.5 M HCl in a lab demo

  • I must use the equation M1V1=M2V2 to mix the correct amount of HCl for lab

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12M HCl is what I have, but I only need 250 mL of 0.5M HCl

I must first look at what I know....

I want 250 mL of 0.5 M HCl. (V1=250 mL and M1=0.5 M)

I have 12 M HCl (V2=12 M)

I need to solve for the V2

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M1V1=M2V2

(.5M)(250mL) = (12M)(V2)

When I solve this equation, I get 10.4 mL for V2

This means that I need 10.4 mL of 12 M HCl.

I will take 10.4 mL of 12M HCl and dilute it to 250 mL.

This will make 250 mL of a 0.5M HCl solution.

Acids, Bases and pH Overview

Ms. Bev Taylor

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