acids, bases and salts

Question 1

vinegar

Answer 1

acetic acid

Question 2

orange lemon

Answer 2

citric acid

Question 3

tamarind

Answer 3

tartaric acid

Question 4

tomato

Answer 4

oxalic acid

Question 5

curd sour milk

Answer 5

lactic acid

Question 6

nettle sting

Answer 6

methanoic acid

Question 7

acids in red litmus

Answer 7

no change

Question 8

acids in blue litmus

Answer 8

turns red

Question 9

acids in phenolphthalein

Answer 9

remains colourless

Question 10

acids in methyl orange

Answer 10

red

Question 11

bases in red litmus

Answer 11

turns blue

Question 12

bases in blue litmus

Answer 12

no change

Question 13

bases in phenolphthalein

Answer 13

pink

Question 14

bases in methyl orange

Answer 14

yellow

Question 15

acid + base

Answer 15

salt + h2o {neutralization}

Question 16

metallic oxides

Answer 16

basic

Question 17

non metallic oxides

Answer 17

acidic

Question 18

ideal ph of our body

Answer 18

7.0 - 7.8 [7.4]

Question 19

ph of acidic rain

Answer 19

ph < 5.6

Question 20

ph of ideal soil

Answer 20

6 - 7 [5.5]

Question 21

what are antacids? ; example

Answer 21

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

Question 22

tooth decay if

Answer 22

ph < 5.5

Question 23

what should be applied over a bee sting

Answer 23

baking soda

Question 24

cure for nettle leave sting

Answer 24

dock plant (generally found nearby in forests)

Question 25

strong acid and weak base

Answer 25

acidic salt

Question 26

weak acid and strong base

Answer 26

basic salt

Question 27

common salt

Answer 27

sodium chloride Nacl

Question 28

sodium hydroxide is formed by ? ; uses

Answer 28

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

Question 29

what is brine

Answer 29

sodium chloride

Question 30

what is formed in electrolysis of brine? its uses?

Answer 30

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

Question 31

how is bleaching powder formed? formula? uses?

Answer 31

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

Question 32

Baking powder formula? uses?

Answer 32

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

Question 33

how is washing soda formed? formula? uses?

Answer 33

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

Question 34

Copper sulphate crystals when heated ; and then reheated again

Answer 34

turn white ; turn blue again

Question 35

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

Answer 35

5

Question 36

number of water molecules in present in one formula unit gypsum

Answer 36

2