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Which of the following describes a homogeneous mixture?
A mixture of sand and iron filings
A solution of salt in water
A mixture of oil and water
A mixture of chalk powder and water
A solution of salt in water
A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. A salt solution is homogeneous because the solute (NaCl) particles are uniformly distributed throughout the solvent (water) at a molecular level, appearing as a single phase.
A homogeneous mixture is a solid, liquid, or gaseous mixture that has the same proportions of its components throughout any given sample. A salt solution is homogeneous because the solute (NaCl) particles are uniformly distributed throughout the solvent (water) at a molecular level, appearing as a single phase.
Think of a homogeneous mixture like a perfectly stirred cup of sugar water; every sip tastes exactly the same, whereas a bowl of cereal is heterogeneous because you can see and separate the distinct parts.
HOMO = Same (Greek root); if you can't spot the boundary, it's homogeneous.
C=VnтАЛ тАФ Molarity representing concentration of solute (n) in volume of solution (V)
╬ФHsolnтАЛ=╬ФHlatticeтАЛ+╬ФHhydrationтАЛ тАФ Energetics of dissolution
When salt (NaCl) dissolves in water, the polar water molecules surround the Na+ and ClтИТ ions, overcoming the electrostatic lattice energy of the salt crystals. This process is known as solvation or hydration. Because the particles are smaller than 1┬аnm in diameter, they form a true solution, which remains stable and does not scatter light (no Tyndall effect).
Homogeneous mixtures exist in a single phase.
Components cannot be seen individually even under a microscope.
They cannot be separated by simple physical methods like filtration.
Solutions are the most common examples of homogeneous mixtures.
Uniform composition ensures consistent concentration throughout.
Easy to transport and measure by volume.
Cannot be separated by simple filtration.
Requires methods like evaporation or distillation to recover components.
Preparation of medicinal IV fluids (saline).
Chemical synthesis in laboratory aqueous environments.
| Feature | Homogeneous (Solution) | Heterogeneous (Suspension) |
|---|---|---|
Visibility of components | Not visible | Visible |
A salt solution is a binary solution consisting of one solute and one solvent.
Option A (Sand and Iron) is heterogeneous because components can be separated by a magnet.
Option C (Oil and Water) is heterogeneous as they form two immiscible layers.
Option D (Chalk and Water) is a suspension (heterogeneous) because particles settle over time.
B is correct тАФ A solution of salt in water is a homogeneous mixture because the salt ions are uniformly distributed in the water, creating a single-phase system.
Always remember: if a mixture appears cloudy or settles, it is likely heterogeneous (suspension or colloid); if it is clear and uniform, it is a homogeneous solution.
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