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Chemistry Reactions of Acids > Chem Reaction of Acids > Flashcards

Chem Reaction of Acids Flashcards

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1
Q

A lower pH is…?

A

more acidic

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2
Q

A higher pH is…?

A

more alkaline

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3
Q

What colors are low pH

A

red/orange

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4
Q

What colors are high pH

A

blue/purple

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5
Q

What is the reaction between acids and bases called?

A

Neutralisation

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6
Q

What is equation for acid + base

A

acid + base —> salt + water

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7
Q

Method for titration

A

1) Use pipette transfer 25cm3 of sodium hydroxide to conical flask
2) Add 2 or 3 drops of indicator
3) Use a funnel to fill burette with acid of known concentration. Record initial volume
4) Place conical flask on white tile so can see colour change more clearly
5) Add acid to alkali until solution is neutral. Swirl at same time
6) Read volume of acid added from burette

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8
Q

What colour is phenolphthalein in acids?

A

colourless

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9
Q

What colour pheno in alkalis

A

pink

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10
Q

What colour is litmus in acids?

A

red

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11
Q

what colour is litmus in alkali?

A

blue

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12
Q

What colour is methyl orange in acids?

A

red

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13
Q

What colour is methyl in alkali?

A

yellow

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14
Q

What happens to strong acids in water?

A

They ionise completely. All the acids dissociate to relase H+ ions

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15
Q

What happens when acids ionise?

A

They produce H+ ions

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16
Q

What happens to weak acids in water?

A

They don’t fully ionise and only a small proportion of acid particles dissociated to produce H+ ions.

17
Q

What happens to the pH if you increase the hydrogen ion concentration

A

Decreases

18
Q

What happens to the pH if you decrease the hydrogen ion concentration?

A

Increases

19
Q

What’s the equation for acid + metal oxide

A

acid + metal oxide —> salt + water

20
Q

Equation for acid + metal hydroxide

A

acid + metal hydroxide —-> salt + water

21
Q

Equation for acid + metal carbonate

A

acid + metal carbonate —-> salt + water + carbon dioxide

22
Q

Making salts

A

1) Gently heat acid in beaker until almost boiling
2) Use spatula add small amounts of copper oxide to acid in excess
3) Filer to remove unreacted copper oxide
4) place copper oxide solution into evaporating basin. Heat gently over a beaker of boiling water
5) water will evaporate and crystallisation will occur

23
Q

Ionic Equation for neutralisation reaction

A

H+(aq) + OH-(aq)—> h20(l)

Chemistry Reactions of Acids (1 decks)

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