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2020 Semester 2 Science Exam > Water Analysis Part 5 > Flashcards

Water Analysis Part 5 Flashcards

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1
Q

What is the pH scale used to determined and what is its range?

A

Whether a solution is acidic or alkaline, ranges from 0-14

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2
Q

What do neutral solutions measure on the pH scale?

A

7

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3
Q

What do strong acids, moderate acids and weak acids measure on the pH scale?

A

Strong acids = 0-2
Moderate acids = 3-4
Weak acids = 5-6

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4
Q

What do weak alkalis, moderate alkalis and strong alkalis measure on the pH scale?

A

Weak alkalis = 8-9
Moderate alkalis = 10-11
Strong alkalis = 12-14

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5
Q

What are indicators?

A

Plant dyes which change colour in acidic or alkaline solutions, used to measure the pH of solutions

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6
Q

What is universal indicator?

A

A blend of many dyes to produce a range of colours that change through the entire pH range

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7
Q

What is a base?

A

Any compound that can neutralise an acid

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8
Q

What is said to happen when acids react with bases?

A

They are said to neutralise

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9
Q

What do neutralisation reactions always produce?

A

A salt and water

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10
Q

What are salts?

A

Ionic compounds that result from the neutralisation reaction of an acid and a base

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11
Q

Acid + Metal Oxide =

A

Metal Salt + Water

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12
Q

Acid + Metal Hydroxide =

A

Metal Salt + Water

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13
Q

Acid + Metal Carbonate =

A

Metal Salt + Water + Carbon Dioxide

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14
Q

Acid + Metal Hydrogen Carbonate =

A

Metal Salt + Water + Carbon Dioxide

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15
Q

Acid + Ammonia Solution =

A

Ammonium Salt + Water

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16
Q

What are spectator ions?

A

Ions which are not involved in the actual reaction during ionic precipitation reactions

17
Q

What are acids?

A

Substances that dissolve in water to produce hydrogen ions

18
Q

What do acids donate when they react and what does that mean about acids?

A

They donate hydrogen ions, therefore all acids must contain hydrogen atoms

19
Q

What does carbonate produce when it reacts with acid?

A

A gas

20
Q

Why is water called the universal solvent?

A

Because of its ability to dissolve a great variety of substances

2020 Semester 2 Science Exam (32 decks)

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