Rose Petal Indicator


HCl is corrosive and toxic.

Methanol is flammable.

Chemicals and Solutions: 

methanol 100 ml

ammonium hydroxide 1M

HCl conc. in dropper bottle


Mortar and pestle

250 ml beaker

magnetic stirrer

buret stand and buret

rose petals


Mix methanol and rose petals in the mortar.  Add 2-3 drops HCl, stir, and decant the liquid into a beaker. Place the beaker on the magnetic stirrer and titrate with the ammonium hydroxide.

To schedule a demonstration, please send an email to the demonstration lab.



Eric Camp

Lecture Demonstration Technician

Bagley Hall 171

(206) 543-1606


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