Which of the following substances can be added to water to form a solution?

Rationale

Table salt can be added to water to form a solution.

When table salt (sodium chloride) is dissolved in water, it dissociates into its constituent ions (sodium and chloride), forming a homogeneous mixture known as a solution. This process allows the ions to interact with the water molecules, leading to a stable and uniform distribution throughout the solvent.

A (Pencil lead) YOUR ANSWER

Pencil lead, primarily composed of graphite, does not dissolve in water; instead, it may break down into small particles that do not form a true solution. Graphite's structure prevents it from interacting effectively with water molecules, resulting in a heterogeneous mixture rather than a solution.

B (Candle wax) YOUR ANSWER

Candle wax is a hydrophobic substance that does not dissolve in water. It remains as a separate phase when mixed with water, leading to a distinct layer rather than forming a solution. The non-polar nature of wax molecules inhibits their interaction with polar water molecules.

C (Table salt) CORRECT

As previously mentioned, table salt is soluble in water and forms a solution, making it the only choice that meets the criteria of the question. The dissolution process involves the separation of sodium and chloride ions, which become surrounded by water molecules, resulting in a uniform solution.

D (Iron filings) YOUR ANSWER

Iron filings do not dissolve in water; they remain as solid particles that can settle at the bottom of the container. The iron's metallic nature prevents it from forming a solution with water, leading to a mixture where the filings can be easily distinguished from the liquid.

Conclusion

The ability of a substance to form a solution in water depends on its solubility characteristics. Among the options presented, only table salt can successfully dissolve and interact with water to create a uniform solution, while pencil lead, candle wax, and iron filings fail to do so, resulting in heterogeneous mixtures.

Which of the following substances can be added to water to form a solution?

Table salt can be added to water to form a solution.

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