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Question

Is milk a homogeneous or heterogeneous mixture?


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Solution

Homogeneous mixture:

  • A mixture which is consists of only a single phase is known as a homogeneous mixture.
  • In this type of mixture, the components must be evenly distributed throughout which represents only one state of matter that can be present in the mixture.
  • Example: A mixture of sugar in water, where the solid sugar dissolves to form a single homogenous phase that would be a homogenous mixture.

Heterogeneous mixture:

  • A mixture which is consists of two or more phases that are immiscible to each other is known as a heterogeneous mixture.
  • The components of heterogeneous mixtures can usually be separated by simple means.
  • Example: Oil and water when present together in a solution, they do not mix evenly, but instead create two separate layers forming a heterogeneous mixture.

Milk is a homogeneous or heterogeneous mixture:

  • Milk is essentially known as a colloidal dispersion of fat in water where various proteins and other naturally occurring surfactants, allow the fat droplets to remain suspended in the water without setting or coalescing.
  • However, as we know that the fat and water components cannot be mixed together to form a solution.
  • There are, therefore, two distinct immiscible liquid phases present, which is why milk is a heterogeneous mixture.

Hence, milk is considered as a heterogeneous mixture.


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