Acids, Alkalis & Neutralisation
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Acids & alkalis
Dissolve an acid in water and it releases hydrogen ions, H+, and it is these ions that make the solution acidic. Alkalis dissolved in water release hydroxide ions, OH-, which make the solution alkaline. The pH scale is a measure of how much hydrogen ion is present, which is why stronger acids sit lower on the scale.
What you know already
From Acids, Alkalis & Titrations you know the pH bands from strongly acidic to strongly alkaline. This note explains what creates those values in water: acids release hydrogen ions and alkalis release hydroxide ions. It then shows how the two ions meet and cancel to make water, the reaction called neutralisation.
Key points of understanding
- Acids added to water form positively charged hydrogen ions, H+.
- It is the hydrogen ions that give the solution its acidity.
- Alkalis in water release hydroxide ions, OH-, which make the solution alkaline.
- The pH scale measures the amount of hydrogen ions present in solution.
- pH below 7 means acidic, above 7 means alkaline, and 7 is neutral.
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1.Acids & alkalis
Dissolve an acid in water and it releases hydrogen ions, H+, and it is these ions that make the solution acidic. Alkalis dissolved in water release hydroxide ions, OH-, which make the solution alkaline. The pH scale is a measure of how much hydrogen ion is present, which is why stronger acids sit lower on the scale.
Key points
- Acids added to water form positively charged hydrogen ions, H+.
- It is the hydrogen ions that give the solution its acidity.
- Alkalis in water release hydroxide ions, OH-, which make the solution alkaline.
- The pH scale measures the amount of hydrogen ions present in solution.
Guided content from the SME authoring corpus — note rn_ZWrmDYtNGnmFycPM, pinned at 286b5ac81d43 · promoted SyllabAI/syllabai-resources e967e75f1339
