If 10 cm 3 of distilled water is added to 10 cm3 of an aqueous salt solution, the concentration of the solution
increases
decreases
remains constant
doubles
Explanation
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When distilled water is added to an aqueous solution, the concentration of the solution decreases. This is because the amount of solute remains the same while the volume of the solution increases.
Let’s consider the initial concentration of the salt solution as
and the initial volume as
. When 10 cm³ of distilled water is added, the new volume becomes
.
The amount of solute remains unchanged, so the new concentration
can be calculated using the dilution formula:
Since
, we have:
Since
is in both the numerator and the denominator, it cancels out, leaving:
As
increases (due to the addition of water), the denominator
increases, making
smaller than
. Therefore, the concentration decreases.
The correct answer is. decreases

