How many capsules of clindamycin hydrochloride, each containing 150 mg, are needed for 30 ml of a 1% solution?

To determine how many capsules of clindamycin hydrochloride are necessary to make a 30 ml solution at a concentration of 1%, you first need to understand what a 1% solution means in terms of concentration.

A 1% solution means that there is 1 gram (1000 mg) of the active ingredient in 100 ml of solution. Therefore, for 30 ml, the amount of clindamycin needed can be calculated using proportionality:

• In 100 ml: 1000 mg

• In 30 ml: (30 ml * 1000 mg) / 100 ml = 300 mg

This means that to create a 30 ml solution of 1% clindamycin, you need a total of 300 mg of clindamycin hydrochloride.

Now, knowing each capsule contains 150 mg of clindamycin hydrochloride, you can determine how many capsules are needed by dividing the total amount required by the amount per capsule:

• Total needed: 300 mg

• Amount per capsule: 150 mg

Calculating this gives:

300 mg / 150 mg per capsule = 2 capsules.

Thus, you need 2 capsules of clindamycin hydrochlor