Q:

Why does salt dissolve more quickly in hot water?

A:

Quick Answer

Salt, as well as any other soluble substance, dissolves quicker in hot water because heat makes the water molecules move faster, creating more space between them. This extra space means the salt molecules more readily make contact with the water molecules, binding to them and creating a solution.

Know More
Why does salt dissolve more quickly in hot water?
Credit: Foodcollection RF - Getty Images

Full Answer

Salt dissolves in water because the water molecule has a negative and a positive end. Chloride ions in salt are negatively charged, while the sodium ions carry a positive charge. The charged ends of the water molecule attract the ions in the salt, breaking the salt’s crystalline formation.

When water is heated, the water molecules move quicker and farther apart. This creates more space between the water molecules, so the salt molecules can bond to them more readily. Stirring also speeds up the process by bringing the salt and water molecules into contact with each other.


Is this answer helpful?

Similar Questions

  • Q:

    Why do things dissolve faster in hot water?

    A:

    According to Science Kids, things dissolve faster in hot water because the molecules in hot water move at a greater speed, bumping more frequently against the solute (the item being dissolved). The more frequent bumping against the solute causes it to dissolve quicker in the water.

    Full Answer >
    Filed Under:
  • Q:

    Why do solids dissolve faster in hot water?

    A:

    Solids dissolve faster in hot water than in cold water because the added heat increases the kinetic energy of the molecules, allowing them to react more quickly with the solid and speeding the chemical reaction. However, certain solvents, such as ionic solutes, have increased polarity at high temperatures, slowing the rate at which the solid dissolves.

    Full Answer >
    Filed Under:
  • Q:

    Why does sugar dissolve more quickly in hot water?

    A:

    The Department of Physics at the University of Illinois states that sugar dissolves faster in hot water than in cold water because hot water gives sugar crystals energy. The hotter the water, the higher the energy, and the faster sugar crystals dissolve.

    Full Answer >
    Filed Under:
  • Q:

    Why do ionic compounds dissolve in water?

    A:

    Ionic compounds dissolve in water because the hydrogen and oxygen atoms in the H2O molecules have partial charges that attract the ions in the solid compound, causing it to dissociate into separated ions. Differences in electronegativity account for the partial positive charge carried by water's hydrogen atoms and the partial negative charge of its oxygen atoms. What is happening to the ionic compound when it dissolves is a separation of its ions from their preexisting solid crystal lattice structure into unattached ions that are free to move about in the solution.

    Full Answer >
    Filed Under:

Explore