Changes in volume of a liquid affects?

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SUMMARY

The discussion centers on the relationship between the volume of a liquid and the number of moles of a dissolved solid. When 50 cm³ of a 250 cm³ solution is transferred, the number of moles of the solid in the new container is indeed reduced to one-fifth of the original amount, while the concentration remains constant. This is due to the definition of molarity, which is the number of moles of solute per liter of solution. Therefore, the number of moles decreases with volume, but the concentration does not change as long as the ratio of solute to solvent remains the same.

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Saado
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I have say a 250cm3 liquid with a solid dissolved inside filled in a container. If I pour 50cm^3 of that liquid in another container, would the number of moles of the solid inside the 50cm^3 container be different to the number of moles in the original 250cm^3 container?

I've been told the number of moles stays the same but to me, it makes sense to say that the moles have decreased because the number of particles of the dissolved solid has decreased. It would make sense to say that the concentration has stayed the same (the same amount of solid in a given volume).

So which of the 2 values changes? The number of moles or the concentration?
 
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50 mls contains 1/5 of the number of moles. Perhaps you are thinking of molarity?

From wikipedia: The concentration of a solution is commonly expressed by its molarity, defined as the number of moles of the dissolved substance per litre of solution.
 
What you think is correct.
 

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