Which substances are soluble in water

This particular resource used the following sources:. Skip to main content. Aqueous Reactions. Search for:. Key Points Solubility is the relative ability of a solute to dissolve into a solvent. Several factors affect the solubility of a given solute in a given solvent.

Temperature often plays the largest role, although pressure can have a significant effect for gases. Sugar and salt are examples of soluble substances. Substances that do not dissolve in water are called insoluble. Sand and flour are examples of insoluble substances. Add a teaspoon of whichever solid you are testing to a glass of cold water and a glass of warm water, stir and observe the difference.

Watch to see if the solid dissolves in the warm water and cold water and if one is better than the other. Things like salt, sugar and coffee dissolve in water. They are soluble. They usually dissolve faster and better in warm or hot water. Everything is made of particles which are always moving. Household vinegar, for example, is a solution of acetic acid in water. The reactions that take place inside living cells depend on the presence of water. Likewise, organisms require water outside of cells to transport nutrients and other substances from place to place, and to carry waste products away.

Tsp each of salt, sugar, flour, oil clear , diluted food coloring and ground coffee not instant. Before beginning, prepare a dilute solution of food coloring by adding several drops of any color to a glass of water.

This will be one of the substances tested in this activity. Distribute a copy of the student page to each group. Have Materials Managers pick up materials for their groups. Show the students a clear glass of water. Ask, Have you ever mixed or stirred something into a glass of water? What happened? Do you think that everything can mix with water?

Tell students that they will observe what happens when they mix different things with water. Before student groups begin, have them predict what will happen when they mix each substance with water.

Have students measure approximately mL of water into each of the six cups. Guide the groups as they conduct their tests, one substance at a time, in separate cups. For each test, ask students to observe the substance. Ask, Is it a liquid or a solid?

Next, have students measure about one teaspoon of the substance into one of the cups of water and stir until there is no change in the mixture. Thermodynamically, such a large decrease in entropy is not spontaneous, and the hydrophobic molecule will not dissolve. Boundless vets and curates high-quality, openly licensed content from around the Internet. This particular resource used the following sources:. Skip to main content. Aqueous Reactions. Search for:.