paulsutton Posted April 16 Share Posted April 16 (edited) I am using some Red Cabbage indicator to investigate the pH of seawater collected locally. I seem to be getting results that imply that local seawater is acidic. I have attached a photo and also attached a pH scale portion of the CompoundChem website https://www.compoundchem.com/2017/05/18/red-cabbage/ According to : https://centerforsurfresearch.org/chemical-composition-of-seawater/ "Seawater has a slightly alkaline composition, ranging between 7.5 and 8.4". Granted, seawater pH probably varies around the world. But this just seems way off. In which case the colour should surely be more towards Purple / Blue The pH indicator does work as I used so know that adding acids or alkalis produces the expected colours. Has anyone else tried this ? Could there be a reason for the acidification, granted the sea was a bit rough when this was collected so there is a chance the colour and acidity could be due to something else being mixed in with the water. I will try and collect some more seawater on a calm day see if that is any different. Just asking as it may help my investigations further. Thanks Paul " Edited April 16 by paulsutton Just a quickj tidy up of the text. Link to comment Share on other sites More sharing options...
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