I have a question regarding the dilution of acids.
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Is more heat released when equal volumes of water are added to sulfuric acid, or when equal volumes of sulfuric acid are added to water?
The total calorie count should be the same, right? However, the intensity of the process varies; the dilution procedure should involve adding acid to water.
The final state of the process is the same. The total heat release is the same as well. However, the temperature rise curve and concentration changes during the process are different. To avoid sharp temperature changes, sulfuric acid should be added to the water. To prevent low-concentration sulfuric acid from corroding the equipment, water should be added to the acid. Because for stainless steel, corrosion becomes severe below 70%, and adding acid to water will inevitably result in a dilute acid. If it’s just very dilute sulfuric acid. Not to mention changes in temperature.
If the final state is the same, the amount of heat released must be the same.
The total amount of heat released is the same, but the intensity of the reaction differs between the two methods. It is recommended to pour sulfuric acid into water, as this approach involves a relatively lower level of risk
No, it should be the latter that releases more heat, because sulfuric acid has a much higher density than other substances; when the volumes are the same, sulfuric acid has a greater mass, and therefore it releases more heat. However, to dilute sulfuric acid, it must be added to water slowly; never add water directly to concentrated sulfuric acid, as this can cause violent boiling and lead to safety accidents.
The same amount; it’s just that concentrated acid is added to water, and the intense heat release at first gives the impression of more
It should be the same amount! Why does acid produce heat when it is mixed with water? Is it a physical phenomenon or a chemical one?
The amount of heat released is the same, but the intensity of heat release varies depending on the order in which the materials are added
What LZ said is that the volumes are the same; in other words, in both cases the mass of sulfuric acid is identical. So why is the mass larger in the latter case?
The end result is the same, so the heat released is also the same.
Sulfuric acid is hygroscopic and releases heat; the higher its concentration, the more heat it releases. In the production of concentrated nitric acid, concentrated sulfuric acid is used as a dehydrating agent to concentrate 45% dilute nitric acid into 98% nitric acid.