Because the sugars and salts and various chemicals (if present) actually dissolve. Hence, it is a solution.
In this case lemonade is a homogeneous solution.
A suspension is the mixture with the largest particles.
suspension
A colloidal suspension is neither a mixture nor a solution.
Its a solution
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Solution
A mixture may be a solution, a suspension, etc.
This is a suspension.
Lemonade is a solution, because it is a mixture of more than one substance.
a mixture
mixture
Suspension
In this case lemonade is a homogeneous solution.
colliod
A suspension is the mixture with the largest particles.
Kool-Aid is a suspension since it is a heterogeneous mixture. :)