NLN NEX Chemistry Practice Test

A dilution by a factor of 4 reduces concentration by what factor?

One-quarter of the original Four times higher Two times lower Unchanged

Correct Answer:

One-quarter of the original

Explanation:

Dilution lowers concentration by the same factor you increase the volume. If you dilute by a factor of four, you quadruple the total volume while the amount of solute stays the same, so the concentration becomes one quarter of the original. In math terms, C_final = C_initial / 4. That means the concentration is reduced to one-quarter of what it was. The other ideas would imply increasing the concentration, halving it, or leaving it unchanged, which isn’t what happens in this dilution.

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