C9 Reactions of Acids Flashcards

1
Q

In terms of pH what is an acid?

A

with a pH less than 7

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2
Q

In terms of pH what is a neutral solution?

A

with a pH of 7

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3
Q

In terms of pH what is an alkali?

A

with a pH above 7

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4
Q

In terms of H+ ions what is an acid?

A

a substance that releases H+ ions when dissolved in water

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5
Q

How is the amount of H+ ions in a solution related to the pH?

A

the more H+ ions, the lower pH

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6
Q

How can you measure the pH of a substance?

A

litnus paper
universal indicator
pH probe

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7
Q

What colour does blue litnus paper become with an acid?

A

Red

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8
Q

What is a strong acid?

A

an acid where the molecules or ions completely ionise in water

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9
Q

What is a weak acid?

A

an acid where the molecules or ions partially ionise in water

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10
Q

What is a salt?

A

a compound formed when a metal ion takes the place of a hydrogen ion in an acid

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11
Q

metal + acid –>

A

salt + hydrogen

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12
Q

metal hydroxide + acid –>

A

salt + water

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13
Q

metal oxide + acid –>

A

salt + water

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14
Q

metal carbonate + acid –>

A

salt + water + carbon dioxide

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15
Q

What is a base?

A

substance that reacts with acids in neutralisation reactions

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16
Q

What is an alkali?

A

substance that dissolves in wate to form a solution above pH 7

17
Q

What is a neutralisation reaction?

A

a reaction between an acid and a base to produce WATER

18
Q

How can you obtain a solid salt from a solution?

A

crystallisation

19
Q

What is a redox reaction?

A

When one element does reduction and the other oxidises

20
Q

What is oxidation?

A

Loss of electrons

21
Q

What is reduction?

A

Gain of electrons