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Chemistry Paper 1 > Topic 4 Acids and bases > Flashcards

Topic 4 Acids and bases Flashcards

1
Q

What does a pH scale go from

A

1 - 14

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2
Q

What is the pH scale measure of

A

How acidic or alkaline solution

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3
Q

What does a low pH mean

A

The solution is acidic

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4
Q

What does ahigh pH mean

A

The solution is alkaline

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5
Q

What is a neutral pH

A

pH 7

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6
Q

What is an indicator

A

A dye that changes colour depending on whether it is above or below a certain PH


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7
Q

What are wide range indicators

A

A mixture of dies that means they gradually change colour of a broad range of pH e.g. universal indicator

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8
Q

What are wide range indicators useful for

A

Estimating the pH of a solution

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9
Q

Why is the universal indicator only an estimate

A

Colour is subjective

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10
Q

What is a pH probe attached to

A

A pH meter

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11
Q

What does a pH probe do

A

Measures pH electronically

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12
Q

How is the pH probe used

A

Placed in a solution you’re measuring at the pH is given on a digital display as a numerical value meaning it is more accurate than indicator

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13
Q

What do acids and bases do to each other

A

Neutralise each other

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14
Q

What is an acid

A

A substance that forms aqueous solutions with a pH of less than seven
Acids form H plus ions in water

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15
Q

What is a base

A

A substance with a pH greater than seven

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16
Q

What is an alkali

A

A base that dissolves in water to form a solution with a pH greater than seven
Phone 0H minus ions in water

17
Q

What is the difference between alkaline and bases

A

Are both bases but only alkali dissolves in water

18
Q

Neutralisation reaction between acid and bases

A

Acid + base -> salt + water

19
Q

Neutralisation between acids and alkalis

A

H+ + OH- -> H2O

20
Q

When an acid neutralise as a base what are the products

A

Neutral and have a pH of seven

21
Q

What can the neutralisation of strong alkalis and acids be used for

A

Calculate the concentration of an acid or alkali by titration

Chemistry Paper 1 (41 decks)

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