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science > Acid + Alkali > Flashcards

Acid + Alkali Flashcards

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Biology 101 flashcards
1
Q

definition of acid

A

substance that dissociates in water to produce hydrogen gas

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2
Q

does all acid contain hydrogen?

A

all acid contains H+ ions, but not all compounds containing hydrogen are acids

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3
Q

formula of hydrochloric acid

A

HCL

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4
Q

formula of sulfuric acid

A

H2SO4

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5
Q

formula of nitric acid

A

HNO3

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6
Q

what are the physical properties of acids

A
  • sour taste
  • turns blue litmus paper red
  • pH smaller than 7
  • conducts electricity when dissolved in water
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7
Q

what are the properties of alkalis

A
  • bitter taste, soapy touch
  • turns red litmus paper blue
  • pH level more than 7
  • conducts electricity when dissolved in water
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8
Q

definition of alkali

A

bases that are soluble in water
aqueous solution that contains hydroxide ions

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9
Q

difference between alkali and base

A

base are metal oxides & metal hydroxide
alkali contains OH- ions
(all alkali are base, but not all base are alkali)

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10
Q

what does acid + reactive metal give

A

salt + hydrogen gas

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11
Q

what is the test for hydrogen used?

A

gas EXTINGUISHES burning splint with a POP sound

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12
Q

what shld be observed when the test is for hydrogen gas

A
  • effervescence observed
  • colourless & odourless gas
  • gas extinguishes burning splint with a pop sound
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13
Q

what does hydrochloric acid + magnesium produce

A

magnesium chloride + hydrogen gas

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14
Q

do all metals react with acids?

A

no. metals like copper, silver, gold dont react with acid

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15
Q

what does acid + metal carbonate produce

A

salt + water + carbon dioxide

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16
Q

what shld be observed when the test is for carbon dioxide

A
  • effervescence observed
  • colourless & odourless gas
  • gas forms white precipate in limewater
17
Q

what does nitric acid + sodium carbonate produce

A

sodium nitrate + water + carbon dioxide

18
Q

what does acid + base produce

A

salt + water

19
Q

what does acid + alkali produce

A

salt + water

20
Q

what does sulfuric acid + calcium hydroxide

A

calcium sulfate + water

21
Q

what does alkali + ammonium salt give

A

salt + water + ammonia

22
Q

what does potassium hydroxide + ammonium nitrate produce

A

potassium nitrate + water + ammonia

23
Q

what shld be observed when the test is for ammonia gas

A
  • colourless & pungent gas
  • gas turns DAMP red litmus paper blue
24
Q

What does higher pH level mean

A

Higher pH level means it’s an alkaline, less acidic

25
Q

What does lower pH level contain

A

More hydrochloric acid

26
Q

What are some examples of indicators

A

Litmus, common indicator, universal indicator, natural indicators, pH metres

27
Q

Definition of indicator

A

Subs that has different colours in acidic and alkaline solutions

28
Q
A
29
Q
A

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