Acids form H+ ions when dissolved in water. This is when the H loses its electron so its simply a proton it is therefore a proton donor.
Bases form OH- ions when dissolved in water. Bases or alkalis are proton acceptors.
A strong acid or alkali is one that is 100% ionised in water. Hydrochloric, sulfuric and nitric acids are all examples of strong acids. Sodium hydroxide and potassium hydroxide are strong alkalis. Weak acids or alkalis are only partially ionised in water - like ethanol, citric acid and carbolic acid, or ammonia for alkalis.
We can tell if we have a strong or weak acid by its Ph, the lower the Ph the stronger the acid and the higher the Ph the stronger the alkali.
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