Welcome!The Topic For Today Is…

Acids and BasesDefinitions Indicators pH Strong or

weak?Reactions

200 200 200 200 200

400 400 400 400 400

600 600 600 600 600

800 800 800 800 800

1000 1000 1000 1000 1000

Bonus Question: 5000 pts

Definitions: 200• Question:• What is the Arrhenius definition of an acid?• Answer• A substance that contributes Hydrogen ions

to water.

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Definitions : 400

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• Question:• What is the Arrhenius definition of a base?• Answer• A substance that contributes Hydroxide ions

to water.

Definitions : 600• Question:• What is the definition of a Bronsted-Lowry

base?• Answer• A substance that accepts a proton.

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Definitions : 800• Question:• What is the definition of a Bronsted-Lowry

acid?• Answer• A substance that donates a proton.

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Indicators: 1000• Question:• What is an amphoteric substance?• Answer• A substance that has properties of an acid

and properties of a base.• Examples: water, hydrogen carbonate ion

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Indicators: 200• Question:• What type of substance turns red litmus

paper blue?• Answer• A base.

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Indicators : 400• Question:• Based on your reading, what is the most

accurate method of obtaining a pH value?• Answer• pH meter

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Indicators : 600• Question:• What is the color of universal indicator when

placed in pure water?• Answer• green

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Indicators : 800• Question:• Give two reasons why pH paper would not be

useful in measuring the pH of blood.• Answer• The color of the blood would obscure the

color change on the paper• The paper is precise enough to measure

blood pH.Back

Indicators : 1000• Question:• What is the color of universal indicator when

ammonia gas is bubbled through?• Answer• Dark blue

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pH: 200• Question:• A neutral solution has a pH of what value?• Answer• 7

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pH: 400• Question:• Where do acids fall on the pH scale?• Answer• Below 7

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pH: 600• Question:• Each integer on the pH scale represents a

_____ fold difference in the concentration of hydrogen ions.

• Answer• 10

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pH: 800• Question:• The value of Kw , the self-ionization constant

of pure water is equal to [H3O+][OH-]. Its numerical value is equal to

• Answer• 1 x 10-14

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pH: 1000• Question:• If the [OH-] is 1 x 10-8, the concentration of

hydronium ions in the same solution is• Answer• 1 x 10-6

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Strong or Weak: 200• Question:• What distinguishes a strong acid from a weak

acid?• Answer• The extent to which dissociation of the acid

occurs.

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• Question:• Would HNO3 be characterized as a strong or

weak acid?• Answer• Strong!

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Strong or Weak: 400

Strong or weak: 600• Question:• When looking at a chemical equation, how is

a strong acid distinguished from a weak acid.• Answer• Double vs. single arrows (→ vs. ↔)

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Strong or weak: 800

• Question:• Many strong bases are made from the

combination of what types of elements with hydroxide?

• Answer• Alkali and alkaline earth metals.

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Strong or weak: 1000

• Question:• Is Na3PO4 considered an acid or a base?• Answer• Strong base

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Reactions: 200• Question:• What kind of reaction takes place when a

base and acid combine to produce water and salt?

• Answer• neutralization

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Reactions: 400• Question:• Name the acid: H2SO4

• Answer• Sulfuric acid

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Reactions: 600• Question:• Predict the conjugate acid formed from the

following reaction: HCl + H2O

• Answer• H3O+

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Reactions: 800• Question:• Predict the conjugate base that forms as a

result of the following reaction:NH4

+ + H2O ↔• Answer• NH3

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Reactions: 1000• Question:• A buffer solution can be made by varying the

concentrations of a weak acid and its______• Answer• Conjugate base

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Bonus Question: 5000 pts.

• Question:• Give the pH of pancreatic juice.• Answer• …• 7.9

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