Red Cabbage with ammonia

Hydrochloric acid is added to the ammonia/Red cabbage extract and the colour change followed

Credit: @AlchemistAngus

Purple primrose in 0.2M sodium hydroxide

Adding 0.1M hydrochloric acid

Red cabbage indicator in white vinegar

Adding 0.2M sodium hydroxide

Purple primrose in 0.1M HCl

Addding 0.2M sodium hydroxide. It shows the swirls of alkali as it is added to the solution as it nears the point of neutralisation

Nickel chloride with ethylenediamine addition

3 aliquots of ethylenediamine are added, then hydrochloric acid is added dropwise to reverse the reaction
Credit: @AlchemistAngus

Purple Pansy in 0.1M HCl

0.2M sodium hydroxide is added dropwise

Purple Primrose extract at pH7

0.1M HCl is added to give the pink colouration, then 0.2M sodium hydroxide is added dropwise. The purple lines correspond to swirls of alkali as it added to the reaction

Butterfly pea flower in white vinegar

Addition of sodium hydroxide dropwise

0.1M Copper sulfate with NaOH and ammonia

0.1M sodium hydroxide is added to form the precipitate of [Cu(H₂0)₄(OH)₂], then ammonia is added to form the [Cu(NH₃)₄(H₂0)₂]²⁺ ion.

Copper sulfate with ethylenediamine

Stoichiometric aliquots of ethylenediamine are added to copper sulfate then hydrochloric acid added to the reaction
Credit: @AlchemistAngus

Haloalkane hydrolysis using fluorescein

Using 2-chloro-2-methylpropane. This reaction is viewed under UV light. Emission of fluorescein is dependent on pH and is quenched as the reaction becomes more acidic

Credit: @iain_smellie

Hydrolysis of 2-chloro-2-methylpropane with phenolphthalein

The reaction procedes to produce an alcohol and hydrochloric acid, this causes the phenolphthalein to decolourise at low pH

Credit: @iain_smellie

Haloalkane hydrolysis with bromothymolblue indicator

Using 2-chloro-2-methylpropane. As hydroysis occurs, the reaction becomes more acidic - causing the indicator to turn from blue to yellow

Credit: iain_smillie

Red cabbage indicator with hydrochloric acid

Adding sodium hydroxide, recorded by volumes

Sloeberry in white vinegar

Adding sodium hydroxide by volum

Purple petunia with white vinegar

Additions of 0.2M sodium hydroxide. Beautiful tranisition

Purple petunia in 0.1M hydrochloric acid

Purple petunia raw images

Photos used to determine RGB values for the reaction

Purple petunia extract

Shows the addition of acid - moving to pink colouration, then once acidic adding alalki forms the green colour

Aquilegia leaf extract in vinegar

Additions of 0.2M sodium hydroxide. Width of columns represents volume of alkali added. One of my first plots

Aquilegia leaf in vinegar vs. pH

Measuring pH with addition of 0.2M sodium hydroxide

Methyl orange in sodium hydroxide

Additions of hydrochloric acid

Margaret's Red Dahlia

In white vinegar with additions of 0.2M sodium hydroxide

Poinsettia in white vinegar

Additions of 0.2M sodium hydroxide

Poinsettia raw images

Photos taken through the experiment to find the RGB values with addition of alkali

Out of gallery