Which is a stronger acid concentrated sulphuric acid or dilute sulphuric acid?
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When it comes to sulfuric acid, dilute sulfuric acid is stronger than a concentrated one. If you go to any industry, you will find that they are storing concentrated acids in stainless steel tanks and the concentration of the acid is not allowed to fall below 95%. This is because when conc acid comes in contact with an iron surface, it reacts to produce sulphates of iron which render the rest of the iron impassive thus protecting it. However, was you go on diluting it, a rather porous deposition occurs on the walls. This promotes attack by the acid. Also, the activity of sulfuric acid increases with dilution. In case of weaker acids, the dissociation increases with dilution, which means that as more and more water is added, more hydrogen ions will be generated. By and large, dilute sulfuric acid is more harmful than concentrated sulfuric acid.
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The presence of water in dilute sulphuric acid increases the hydrogen ion concentration. Hence it is a stronger acid than concentrated sulphuric acid which contains comparatively less water.
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