If reconstituting a liquid antibiotic requires 90 ml of distilled water and 1/3 of the water should be added first, how much water is needed to moisten the powder?

To determine how much distilled water is needed to moisten the powder when reconstituting a liquid antibiotic that requires a total of 90 ml of water, it is essential to consider the instruction to add 1/3 of the required water first.

Calculating 1/3 of 90 ml involves dividing 90 by 3, which results in 30 ml. This portion is the correct amount of water needed to initially moisten the powder. By adding this amount first, it ensures that the powder is adequately softened and can be effectively dissolved before adding the remaining water.

This initial step of adding 30 ml plays a crucial role in the reconstitution process, enhancing the dissolution of the antibiotic powder in the total volume of 90 ml.