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Nat 5 Chemistry > The pH scale > Flashcards

The pH scale Flashcards

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1
Q

The pH scale is continuous from below _____ to above _____

A

0 and 14

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2
Q

What type of solution has a pH less than seven

A

Acidic

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3
Q

What type of solution has a pH more than seven

A

An alkali or base

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4
Q

What pH do pure water and neutral solutions have

A

Seven

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5
Q

Two common acids you use at home

A

Lemon and vinegar

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6
Q

Two common alkalis you use at home

A

Baking soda and salt water

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7
Q

What type of solution is formed when ammonia dissolves in water

A

Alkali

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8
Q

Why do you think alkalis can conduct electricity

A

There ions are free to move when dissolved in water

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9
Q

What type of bonding do acids have

A

Ionic bonding

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10
Q

Do alkalis conduct electricity

A

Yes because their ions are free to carry charge

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11
Q

What type of bonding do alkalis have

A

Ionic

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12
Q

Which gas is always produced at the negative electrode when acids are electrolysed

A

Hydrogen

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13
Q

Which ion is present in all acid solutions

A

H+

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14
Q

Which ion is present in all alkaline solutions

A

OH-

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15
Q

In water and neutral solutions how do the concentrations of hydrogen ions and hydroxide ions compare

A

They are equal

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16
Q

How do the concentration of hydrogen ions and hydroxide ions compared to in an acidic solution

A

More hydrogen ions in an acid

17
Q

How do the concentration of hydrogen ions and hydroxide ions compare in an alkaline solution

A

More hydroxide ions in alkalis

18
Q

What happens to the concentration of hydrogen ions if an acid is diluted (what happens to the PH)

A

The pH will move towards seven as a solution is becoming less acidic

19
Q

What happens to the concentration of hydroxide ions if an alkali is diluted (what happens to the PH)

A

The pH decreases towards seven

20
Q

How well does pure water conduct electricity

A

Not very well

21
Q

Explain how water conducts electricity using equilibrium

A

the concentrations of reactants and products are the same

Nat 5 Chemistry (9 decks)

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