How does crushing increase the rate of dissolving and when salt is dissolved in water is there any increase in the volume of the solution why?
Crushing a solid substance can indeed increase the rate of its dissolution in a solvent, such as water. This phenomenon is primarily due to an increase in the surface area of the solid that comes into contact with the solvent. When a solid is crushed into smaller particles, it exposes more surface area per unit mass. This increased surface area provides more opportunities for solvent molecules to come into contact with the solid particles, leading to a higher rate of dissolution.
To illustrate this concept, imagine a sugar cube versus granulated sugar. If you place a sugar cube in water, only the outer layer of the cube is exposed to the solvent, slowing down the dissolution process. However, if you use granulated sugar, which has much smaller particles, the sugar dissolves faster because more sugar particles are exposed to the water at the same time.
As for your second question, when salt is dissolved in water, there is typically no significant increase in the volume of the solution. This is because the volume of the solvent molecules (in this case, water molecules) and the volume of the dissolved particles (ions from the salt) are relatively small compared to the overall volume of the solution. The gaps between water molecules are usually enough to accommodate the dissolved ions without causing a significant increase in volume.
In other words, the volume change resulting from dissolving salts, sugars, or other soluble substances in water is usually negligible under typical conditions. However, it's important to note that there are exceptions, such as when extremely concentrated solutions are prepared, or when specific chemical reactions occur during dissolution, which could potentially lead to changes in volume.
When powder the salt its solubility increases. but when salt dissolved in water its volume it is not necessary however it depends on salt what is to be dissolved for example in case of sugar volume increases .
The level of water does not change when salt is dissolved in water because the salt particles dissociate and occupy the intermolecular spaces between the water particles. Since only the empty spaces are occupied, the level of water does not increase. When common salt is dissolved in water, what will be the change in volume and why? There will be no change in volume as the salt gets into the spaces present between the water molecules. Adding salt (NaCl) to water actually does increase the volume a little bit, although by less than the volume of the added salt. The Na+ and Cl- ions fit nicely in the water, not taking up much room. The sodium chloride molecules will break down into Na+ and Cl- ions and be constantly collided by the water molecules, forcing it to spread out into a low concentration state. This is called diffusion. The volume of water of increase by the volume of the salt, theoretically. When salt is dissolved in fresh water, the density of the water increases because the mass of the water increases. When sodium is added to water, the sodium melts to form a ball that moves around on the surface. It fizzes rapidly before it disappears. Compared to the volume of the solution, or to the solvent, the volume of your solute is so tiny; at the same time, the solute will dissolve in your solvent. So the solute will not account to the volume of a solution. Back to the point, when we dissolve table salt, an ionic compound, in water, the water molecules break away from the hydrogen bonds to solvate the ions. This enables the water molecules to exist closer to each other and greatly reduces the space between water molecules, reducing the overall volume of the solution. When we crush a solid there is a greater surface area of the solid solute, meaning there are more collisions between the solute and solvent particles. More collisions mean the rate of dissolving is faster. This means the greater the surface area of a solute is the faster it dissolves. Crushing a solute helps to increase the rate of dissolving by increasing the surface area of the solute. If more solvent can come in contact with a greater amount of solute, the rate of dissolving increases.
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