acid alkali and titrations

Question 1

phenophalein

Answer 1

colourless is acidic

alkaline is pink

Question 2

methyl orange

Answer 2

red is acidic

yellow alkaline

Question 3

litmus paper

Answer 3

red acidic
purple neutral
blue alkali

Question 4

acid + metal oxide –> salt + water

Answer 4

–> salt + water

Question 5

acid + ammonia

Answer 5

ammoniUM salt
note not ammonia salt
NH4NO3

Question 6

titrations

Answer 6

add alkali with a pipette and pipette filler.
fill the biurette with acid
put indicator in the alkali
do a rough titration where you work a rough value
then doing it again but stop adding acid a few cm3 before
then add acid dropwise. When there is a colour change in hte indicator record value on biurette.

Question 7

substances which are always soluble

Answer 7

sodium, potassium and ammonium

nitrates

Question 7

substances which are always soluble

Answer 7

sodium, potassium and ammonium

nitrates

Question 8

chlorides
sulfates
solubility

Answer 8

chlorides are soluble except silver and lead

sulfates except barium lead and calcium

Question 9

carbonates hydroxides solubility

Answer 9

insoluble except for SPA

insoluble except fo sodium potassium and calcium

Question 10

making insoluble sulfates

lead sulfate

Answer 10

add two dissolved soluble salts together
react them in a test tube
precipitate will be formed 
then filter out the preciptate out 
rinse

Question 11

making a soluble salts

Answer 11

by reacting an acid that contains one of the ions and an insoluble base
heat up the acid
add the base in excess and then filter off
water and salt will be produced
evaporate of water to allow water to crystallise.

Question 12

making copper sulfate crystals

Answer 12

Add copper oxide to sulfuric acid until in excess
filter off excess copper oxide
boil off some of the water to concentrate the solution
keep heating until a saturated solution is formed
test by dipping glass rod into it if crystals begin to form onto it
stop heating the reaction mixture and allow it to cool
remove crystals by filtration or by pouring it off

Question 13

what makes soluble solute

Answer 13

acid + metal carbonate

acid + metal oxide/ hydroxide

Question 14

sodium potassium and ammonium salts

Answer 14

you need to do a titration firstly

as they are soluble

Question 15

sodium sulfate crystals

Answer 15

25 cm of NaOH is transferred to a conical flask using a pipette and a few drops of methyl orange are added as the indicator
sulfuric acid is run until colour change this is known as the rough titration
then actual titration is done without indicator heated wihtout any of the indicator
when saturated solution is formed then left to cool
finally crystals are separated