Temperature does affect the dissolving of sugar and salt, but not in the same way.

In general, increasing the temperature of a solvent (such as water) increases the rate at which a solute (such as sugar or salt) dissolves. This is because higher temperatures provide more kinetic energy to the solvent molecules, allowing them to move faster and collide with the solute particles more frequently and with greater force. As a result, the solute particles are more likely to break apart and mix with the solvent.

However, sugar and salt have different dissolution behaviors due to their molecular structures. Sugar (sucrose) is a covalent compound that consists of individual molecules held together by relatively weak intermolecular forces. When sugar is added to water, these intermolecular forces are gradually overcome as water molecules surround and interact with each sugar molecule. Therefore, sugar dissolves relatively easily in water at room temperature or even lower temperatures.

On the other hand, salt (sodium chloride) is an ionic compound composed of positive sodium ions (Na+) and negative chloride ions (Cl-). When salt is added to water, the polar water molecules attract and surround these ions due to their opposite charges. The attraction between water molecules and ions is stronger than the intermolecular forces within salt crystals. Therefore, salt requires higher temperatures than sugar to dissolve because it takes more energy to break apart the ionic bonds holding its crystal lattice structure together.

In summary, while both temperature and solubility are related for both sugar and salt, they have different dissolution behaviors due to their molecular structures. Sugar dissolves easily in water at room temperature or lower temperatures, while salt requires higher temperatures for efficient dissolution.

Dr Fatemeh Gharahdaghigharahtappeh thank you for your contribution to the discussion

Yes, salt and other ionic compounds like it will dissolve faster the hotter the water it is dissolved in. This is because hot temperatures make atoms move quicker and the quicker they move, the easier they come apart. Also, the size of the sugar molecule is greater than that of the salt molecule. Thus a single sugar molecule can attract more water molecules than the table salt leading to its faster dissolution in water. Sugar has a higher solubility in water so it should more sugar should dissolve than salt. Flour is insoluble and is not expected to dissolve. As the temperature increases, more and more sugar can be dissolved, but only slightly more salt can be dissolved. Sugar should dissolve faster in solvents than salt does. The reason for this is because the sugar molecules are bigger than the ions of dissolved salt. This allows for more water molecules to surround a single particle, pulling it into solution faster. The reason for this is salt is an ionic compound, while sugar is a covalent compound. Ionic compounds generally have much higher melting points than covalent compounds. This is because to melt an ionic compound you have to weaken the ionic bonds between the ions. Increasing the temperature of water, decreases the time it takes to dissolve the sugar in water. At a higher temperature, there are more spaces between the water molecules for the sugar to dissolve into so the solution forms more quickly. Sugar had a similar effect on boiling point temperature. Sugar did not raise boiling point temp. as much as salt because sugar molecules are 6 times larger than salt molecules and therefore there are many more salt molecules in 1 tsp than sugar molecules. This results in more salt water bonds than sugar water bonds. Most solids, including sugar and salt, become more soluble with increasing temperature. This is because heat increases molecular movement, causing more collisions between the water molecules and the solid. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. This added movement tends to make the bonds between sucrose molecules easier to overcome.Sugar dissolves in water at 0 degrees Celsius. This is because sugar is soluble in liquid water at all temperatures at standard pressure. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come in contact with the sugar more often, causing it to dissolve faster. Sugar dissolves better in hot water as the temperature is higher than in cold water. Solids become more soluble as the temperature increases and hence, sugar being solid is easily soluble in hot water. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster. As they move faster, they come in contact with the sugar more often, causing it to dissolve faster. Less sugar is visible in the hot water than in the cold, meaning that more sugar dissolves in the hot water than in the cold water. There is no obvious difference between the amounts of salt that dissolves in the hot water compared to the cold water. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. This added movement tends to make the bonds between sucrose molecules easier to overcome. Most solids, including sugar and salt, become more soluble with increasing temperature. This is because heat increases molecular movement, causing more collisions between the water molecules and the solid. But the opposite is true for gases, which tend to become less soluble as a solvent's temperature increases.

In practical terms, you can easily dissolve sugar in room-temperature water (around 68-72 degrees Fahrenheit or 20-22 degrees Celsius), and it will dissolve even more quickly in hot water. The exact rate of dissolution will depend on factors like the size of sugar crystals, stirring, and the concentration of sugar you're trying to achieve.

Solubility of the most of the salt rises with increase in temperature. This is because with increase in temperature, kinetic energy of the molecules increases and the solvent molecules break apart the solute molecules that are held together by intermolecular attractions more effectively. The solubility of any given solute depends on the temperature of the solution. Solubility of solutes like salt increases with an increase in temperature whereas the solubility of substances like calcium sulphate decreases as temperature increases. Most solids, including sugar and salt, become more soluble with increasing temperature. This is because heat increases molecular movement, causing more collisions between the water molecules and the solid. But the opposite is true for gases, which tend to become less soluble as a solvent's temperature increases. At a higher temperature, there are more spaces between the water molecules for the sugar to dissolve into so the solution forms more quickly. The molecules of water are also moving faster at a higher temperature and this causes the dissolution rate to increase as well. With an increase in temperature solubility of liquids and solids increases. In the same way solubility of gases decreases with an increase in temperature. Both will be more easily soluble in hot water as compared to normal or cold water. Salt dissociates in water to form ions. These ions have full charges and interact with the partial charges on water. Sugar however, has polar covalent bonds in parts of the molecule. This allows sugar to interact with the partial charges on water and dissolve as well, even though it is not an ionic compound.There is not much difference in the amount of salt that dissolves in the hot and cold water. Sucrose has many O–H bonds which are Polar. The same amount of sugar is added to hot and cold water. More sugar dissolves in the hot water than the cold water. There is no obvious difference between the amounts of salt that dissolves in the hot water compared to the cold water. This shows that temperature affects the dissolving of sugar more than it affects the dissolving of salt. The addition of more heat facilitates the dissolving reaction by providing energy to break bonds in the solid. This is the most common situation where an increase in temperature produces an increase in solubility for solids. An increase in temperature puts a stress on the equilibrium condition and causes it to shift to the right. The stress is relieved because the dissolving process consumes some of the heat. Therefore, the solubility increases with an increase in temperature.