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Red Cabbage with ammonia
Hydrochloric acid is added to the ammonia/Red cabbage extract and the colour change followed
Credit: @AlchemistAngus
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
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
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
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
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
Credit: iain_smillie
Red cabbage indicator with hydrochloric acid
Adding sodium hydroxide, recorded by volumes
Sloeberry in white vinegar
Adding sodium hydroxide by volum
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