what is scope&limitation of this experiment?

[Redlady]

experiment:Kamote Tops, Rose Petals, and Red Onion as Alternative to Litmus Paper




Procedure:



*Making Litmus liquids


1.Rose petals

-Put Red rose petals in HCI and leave it for around 3 hours

-Filter HCI

-put a filter paper(gauze) around 5 minutes and dry.



2.Red onion

-Cut a red onion into pieces and put them into Bunsen burner

-pour a water into Bunsen burner and boil

-when color has soaked out, turn off the burner and cool it.

-filter the liquid



3. Kamote tops

-Get kamote leaves(tops)




*testing indicators

1.Rose petal indicator

-put vinegar, soapy water, and baking soda into indicator (one by one)

-observe a change of color of indicator
( If you had put a vinegar, a color should be changed into red.
If you had put a soapy water, a color should be changed into light green
If you had put a baking soda, a color should be changed into light green.)


2. Red onion indicator


-put vinegar, soapy water, and baking soda into indicator (one by one)

-observe a change of color of indicator
( If you had put a vinegar, a color should be changed into red.
If you had put a soapy water, a color should be changed into light green
If you had put a baking soda, a color should be changed into light green.)


3. kamote tops


-put vinegar, soapy water, and baking soda into indicator (one by one)








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what is scope&limitation of this experiment?

any help appreciated

[peppercat]

I think the cope of the experiment is the strength of the acid or alkali needed to produce these colour changes. does it work still for weak acids and alkalies . Also the experiment will not tell you the pH of your acid/alkali as will only say if above or below pH 7 . Universal indicator would give a more acurate result. In the rose petal experiment if all of the HCL is not filtered off and a little remains the result would be incorrect as a weak alkali would just neutralise the HCL and not give appropriate colour change. Hope this helps a little.