Which of the following methods correctly describes a 1:10 dilution?

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Multiple Choice

Which of the following methods correctly describes a 1:10 dilution?

Explanation:
A 1:10 dilution means the final mixture has ten parts total, with one part being the sample and nine parts being diluent, so the concentration is reduced to one-tenth. Mixing 1 part sample with 9 parts diluent achieves this exactly. The other options do not fit: mixing 10 parts sample with 1 part diluent keeps most of the original concentration, not 1/10. Mixing 1 part sample with 99 parts diluent yields a 1:100 dilution, and mixing equal parts water and diluent gives a 1:2 dilution. Therefore, the correct method is 1 part sample with 9 parts diluent.

A 1:10 dilution means the final mixture has ten parts total, with one part being the sample and nine parts being diluent, so the concentration is reduced to one-tenth. Mixing 1 part sample with 9 parts diluent achieves this exactly. The other options do not fit: mixing 10 parts sample with 1 part diluent keeps most of the original concentration, not 1/10. Mixing 1 part sample with 99 parts diluent yields a 1:100 dilution, and mixing equal parts water and diluent gives a 1:2 dilution. Therefore, the correct method is 1 part sample with 9 parts diluent.

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