In the following experiments wash the test tube and the measuring cylinder before each use. You are provided with Solution A (a) Place three drops of solution A on a white tile and add one drop of iodine solution. Record your observation (b) Put 10cm³ of solution A in a beaker and add a few drops of dilute tetraoxosulphate (vi) acid (H\(_2\)SO\(_4\),) in a test tube and boil fora few minutes. Then add a few drops of sodium hydroxide solution and allów the mixture to cool. Divide the mixture into two equal portions
Explanation
(a) solution A is a corn starch solution
TEST PERFORMED
(a) Solution A, placed on a white tile + 1 drop of iodine solution
(b) Solution A + a few drops of dilute acidH\(_2/)SO/(_4/) and boiled + a few drops of sodium hydroxide and allowed to cool. Mixture is divided into two equal parts
(i) One portion of the mixture + iodine solution
(ii) Another portion of mixture + equal amount of Fehling's
(c) A fresh portion of solution A + enzyme left in a hot water bath for five minutes
(i) A small portion of it + a few drops of iodine solution
(ii) Another portion of the mixture t equal portions of solutionA and B and warmed Fehling's solution A and B and warmed
OBSERVATION
(a)Blue - black colour is observed
(b)(i)Brown colour is observed (iodine colour)
(ii)Brick red or reddish-brown or orange colour is observed
(c) (i)Brown colour or colour of iodine is observed
(ii) Brick red precipitate is observed