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GCSE > Acids and bases > Flashcards

Acids and bases Flashcards

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1
Q

what happens when you add acid or alkali to water

A

positively charged hydrogen ions or negative hydroxide ions

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2
Q

what colour does phenolphthalein go in acids and alkali

A

colourless in acids and pink in alkali

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3
Q

what colour does litmus paper go in acids and alkalis

A

red in acids blue in alkalis

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4
Q

what colour does Methyl orange go in acids and alkalis

A

red in acids and yellow in alkalis

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5
Q

what happens when you increase the PH by 1

A

a decrease in factor 10 in hydrogen concentration

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6
Q

what happens when you decrease the ph by 2

A

you increase the hydrogen concentration by 100

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7
Q

Tell me the method for the neutralisation reaction for acids and bases neutralisation reaction

A

measure a volume of HCL into a conical flask
add a fixed mass CaO into HCL
wait for base to completely react and record the PH of the solution using glass rod if u added UI
repeat till unreacted CaO on bottom of flask
Plot graph

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8
Q

Explain a strong acid

A

ionise completely in water as large amounts of acid molecules dissociate to release H+

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9
Q

explain a weak acid

A

do not fully ionise and set up reversible reaction as only few proportion of acids dissociate to release H+

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10
Q

what is a concentrated solution

A

large amount of solute in a given volume of solution per dm3

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11
Q

What is a Alkali

A

a water soluble base

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12
Q

what are the four reaction of acids and metals we must know

A

acid + metal oxide
acid + metal hydroxide
acid + metal
acid + metal carbonate

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13
Q

what are the results of metal oxide

A

salt + water

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14
Q

what are the results of acid and metal hydroxide

A

salt + water

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15
Q

what are the results of acid + metal

A

salt + hydrogen

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16
Q

what are the results of acid + metal carbonate

A

carbon dioxide + water + salt

17
Q

what is a neutralisation reaction

A

a chemical reaction between acid and base forming a salt

18
Q

what is the test for hydrogen

A

burning splint if present squeaky pop due to hydrogen burning with oxygen

19
Q

what is the test for carbon dioxide

A

bubble through limewater if present turn cloudy

GCSE (97 decks)

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