paulsutton Posted April 22, 2023 Share Posted April 22, 2023 This is sort of related to my post on Red Cabbage indicator in the Amateur Science section. https://www.scienceforums.net/topic/131382-red-cabbage-indicator/ So in terms of experiments that cause a change in pH should this be referred to as increasing and decreasing pH of a solution / substance. For example if I take Vinegar which is Acidic (so pH will be between i think 6 and 1, and add Sodium Hydrogen Carbonate, which is an Alkali (pH 8 to 14). then the acid either neutralised or becomes more alkali, so the pH has increased. pH 7 being neutral of course. I am trying to write up an experiment or an idea I have had at least, and want to make sure I use the correct terminology. Thanks Paul Link to comment Share on other sites More sharing options...
exchemist Posted April 22, 2023 Share Posted April 22, 2023 1 hour ago, paulsutton said: This is sort of related to my post on Red Cabbage indicator in the Amateur Science section. https://www.scienceforums.net/topic/131382-red-cabbage-indicator/ So in terms of experiments that cause a change in pH should this be referred to as increasing and decreasing pH of a solution / substance. For example if I take Vinegar which is Acidic (so pH will be between i think 6 and 1, and add Sodium Hydrogen Carbonate, which is an Alkali (pH 8 to 14). then the acid either neutralised or becomes more alkali, so the pH has increased. pH 7 being neutral of course. I am trying to write up an experiment or an idea I have had at least, and want to make sure I use the correct terminology. Thanks Paul Yes, pH can increase or decrease, or one can speak of a low (acid) or high (basic) pH. 1 Link to comment Share on other sites More sharing options...
paulsutton Posted April 22, 2023 Author Share Posted April 22, 2023 Cool thanks Paul Link to comment Share on other sites More sharing options...
MigL Posted April 22, 2023 Share Posted April 22, 2023 In any quantity of water there are a number of molecules which dissociate and re-associate H2O <> H+ + OH- The potential Hydrogen is an inverse logarithmic measure of the number of H+ ions in solution and their reactive potential; and the reason water has a 'neutral' pH of 7. I'm sure Wikipedia has an entry for pH. Link to comment Share on other sites More sharing options...
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