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Science > acids, bases and salts > Flashcards

acids, bases and salts Flashcards

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Biology 101 flashcards
1
Q

vinegar

A

acetic acid

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2
Q

orange lemon

A

citric acid

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3
Q

tamarind

A

tartaric acid

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4
Q

tomato

A

oxalic acid

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5
Q

curd sour milk

A

lactic acid

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6
Q

nettle sting

A

methanoic acid

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7
Q

acids in red litmus

A

no change

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8
Q

acids in blue litmus

A

turns red

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9
Q

acids in phenolphthalein

A

remains colourless

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10
Q

acids in methyl orange

A

red

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11
Q

bases in red litmus

A

turns blue

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12
Q

bases in blue litmus

A

no change

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13
Q

bases in phenolphthalein

A

pink

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14
Q

bases in methyl orange

A

yellow

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15
Q

acid + base

A

salt + h2o {neutralization}

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16
Q

metallic oxides

A

basic

17
Q

non metallic oxides

A

acidic

18
Q

ideal ph of our body

A

7.0 - 7.8 [7.4]

19
Q

ph of acidic rain

A

ph < 5.6

20
Q

ph of ideal soil

A

6 - 7 [5.5]

21
Q

what are antacids? ; example

A

get rid of acidity in stomach, made of mild bases ; milk of magnesia

22
Q

tooth decay if

A

ph < 5.5

23
Q

what should be applied over a bee sting

A

baking soda

24
Q

cure for nettle leave sting

A

dock plant (generally found nearby in forests)

25
Q

strong acid and weak base

A

acidic salt

26
Q

weak acid and strong base

A

basic salt

27
Q

common salt

A

sodium chloride Nacl

28
Q

sodium hydroxide is formed by ? ; uses

A

electrolysis of brine ; used as lubricant, soaps, detergent, paper making, artificial fibres

29
Q

what is brine

A

sodium chloride

30
Q

what is formed in electrolysis of brine? its uses?

A

Cl2 gas at anode - swimming pools, pvc, cfc, pesticides, disinfectants

H2 gas at cathode - margarine, fuel, ammonia

sodium hydroxide (NaOH) - lubricant, soaps, detergent, paper making, artificial fibres

31
Q

how is bleaching powder formed? formula? uses?

A

cl2 gas on slaked lime ; CaOCl2 ; bleaching, oxidizing agent, disinfecting water

32
Q

Baking powder formula? uses?

A

NaHCO3 ; making of baking soda (by adding sodium carbonate), baking (releases CO2 when heated), in antacids as alkaline, fire extinguishers

33
Q

how is washing soda formed? formula? uses?

A

recrystallization of sodium carbonate (basic salt) ; Na2CO3 . H2O ; soap, glass, paper, cleaning agent, borax, removing hardness of water

34
Q

Copper sulphate crystals when heated ; and then reheated again

A

turn white ; turn blue again

35
Q

number of water molecules in present in one formula unit of copper sulphate

A

5

36
Q

number of water molecules in present in one formula unit gypsum

A

2

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