What is a solution with water?
- October 8, 2026
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Explanations and Definitions Any solutions made of oil, hexane, benzene, toluene, or another solvent that is not water are examples of non-aqueous solutions. An aqueous solution is not produced when a substance combines with water to form a mixture that does not dissolve.

For instance, combining water and sand does not result in an aqueous solution. Example Aqueous Solution Chemistry Problems
Students encounter a few different types of chemistry problems concerning aqueous solutions. Questions of solubility and colligative properties dominate these. For instance, which solute results in an aqueous solution? nitrate of sodium (NaNO3) carbonate of calcium (CaCO3) hydroxide of silver (AgOH) Sulfide of copper(I) (Cu2S) Technically, this is not a great question because all ionic compounds form aqueous solutions, even if they are very poorly soluble. This is because ionic compounds, like water, are polar molecules. However, the purpose of a question like this is to teach students about solubility rules. Based on these rules, only sodium nitrate is highly soluble in water. The majority of carbonates, hydroxides, and sulfides are insoluble, with these specific compounds not being an exception. Colligative properties are another common topic of inquiry. The number of particles that are dissolved in water determines the ligative properties, such as the depression of the freezing point and the elevation of the boiling point. A compound’s boiling point or freezing point rise or fall in proportion to the extent to which it dissociates into ions or to its concentration. Example: Which aqueous solution has the lowest freezing point?
Solution of 0.1 molal urea (CH4N2O) 0.1 molal sucrose (C12H22O11) solution
0.1 molal sodium chloride (NaCl) solution
0.1 molal solution of calcium chloride (CaCl2) It is important to note that the compounds’ freezing points are irrelevant. You only need to look at the number of particles that each molecule breaks down into in an aqueous solution because all of the solutions have the same concentration. Because they are covalent compounds, uraea and sucrose dissolve in water but do not separate into ions. You know this because the compounds are organic. Calcium chloride and sodium chloride remain as a result. These two substances are ionic and water-soluble. They dissociate into their ions in aqueous solution. But, sodium chloride only breaks into two ions or particles (Na+, Cl–). Meanwhile, three ions—Ca2+, Cl–, and Cl–—are formed when calcium chloride breaks down. So, the 0.1 molal calcium chloride solution has the lowest freezing point.
Take, for instance, the watery solution with the highest boiling point. 0.1 M NaCl
C12H22O11 sucrose (0.1 M) 0.1 M CaCl2
0.1 M AlCl3
Work this problem exactly like the freezing point depression question. First, ensure that the compounds can be dissolved in water. Next, check the concentration of the solutions. In this case, all four compounds are soluble and have the same concentration values. Finally, compare the number of particles released when each of the compounds dissolves in water. Sucrose dissolves but does not dissociate so it only forms one particle and has the least effect on boiling point. NaCl forms two particles, CaCl2 forms three particles, and AlCl3 forms four particles (Al3+, Cl–, Cl–, Cl–). The solution containing aluminum chloride has the highest boiling point.



















