Indicator Prac (1 Viewer)

[peony]

In the practical experiment on indicators, our school did the red cabbage experiment and i am wondering what are the experimental errors that are involve and methods or ways to improve accuracy.

thanks in advance

 

[fuckfoot]

the only thing i can think of is the ratio of indicator to.. indicat-ee(?)
ah, you know waht i mean, anyway i only remember that if you put too much indicator in, it becomes very difficult to see subtle changes and thus the experiment has failed terribly
and for accuracy there is nothing better than repetition...

 

[xiao1985]

true... also, when checkin the soln in neutral (normal water), the color gets lighter... it CAN be recognised as a change in color (by pplz lyk me), altho sometimes it is not necessarily the case...

 

[t-i-m-m-y]

colour changes indicate ph

lol; we errr.. put some indicator in the indicator; just to indicate the ph of the indicator lol

 

[xiao1985]

Originally posted by t-i-m-m-y
colour changes indicate ph

lol; we errr.. put some indicator in the indicator; just to indicate the ph of the indicator lol

can u do that?? i fink u need probe to do that/.... =p blehz

 

[Xayma]

Originally posted by xiao1985
can u do that??

The colour of the indicator when its in the bottle indicates its pH

 

[BlackJack]

Well (as an extra thing), do you know the range of the ph the red cabbage indicator changes..?

Many indicators change colour at ph other than 7, so weak acids/bases produce vague results if you use only red cabbage.

 

[peony]

Originally posted by BlackJack
Well (as an extra thing), do you know the range of the ph the red cabbage indicator changes..?

nope, what is it ?