( p block) test for amphoterism

Question 1

Test for amphoteric metals

Answer 1

• add few drops naoh to sample
• note colour of ppt that forms
• add more naoh to excess
• if ppt redissolves then it is amphoteric

Question 2

what does amphoteric mean?

Answer 2

chemical that can behave as an acid and a base depending upon their environment

Question 3

Results for colour in amphoteric test for lead aluminium and zinc:
ppt:
redissolves:
Results for chromium:
ppt:
redisoolves:

Answer 3

• white ppt and colourless solutions
• then chromium blue-grey precipitate and blue grey solution
  all are amphoteric*