Help have exam tomorrow AS Biology- 31 doubts

[farhan143]

can any 1 explain me the steps i dont understand ....




This is form 2011 may june...
i dont understand the steps can some1 please quickly help me out
i need explaination on this.....

 

[farhan143]

please someone reply to this thread i am in deep need of guidance!!!!!!!!!!!!!!!

 

[glitteringhope]

basically you first make the serial dilutions ..then you perform the experiment without any copper sulfate... i.e place idoine drops as marked on tile and then add a drop of the solution in test tube at 15 seconds to the first one at 30 sec to second one..and son and record the time taken for colour to change and then repeat with various concentrations of copper sulfate..to see what effect it has on reaction rate

 

[farhan143]

basically you first make the serial dilutions ..then you perform the experiment without any copper sulfate... i.e place idoine drops as marked on tile and then add a drop of the solution in test tube at 15 seconds to the first one at 30 sec to second one..and son and record the time taken for colour to change and then repeat with various concentrations of copper sulfate..to see what effect it has on reaction rate

if i keep on adding 1cm cube of copper sulfate sol. to the next testube and add 9 cm of distilled water to it and so on..
then wudn't the 2nd and 3rd test tube wud have 9cm cube in volume since we are transferring 1 cm cube after adding distilled water.................

 

[glitteringhope]

what you do is take two cm3 of first solution and 18 cm3 of water..then separate it and keep one part for the experiment...use the other for the next dilution