The proper concentration of Benzalkonium in an eye drop is 1 gram of Benzalkonium Chloride in 750 ml of liquid. How much Benzalkonium Chloride will a pharmacist need for a 30 ml bottle of eye drops?

To determine how much Benzalkonium Chloride is needed for a 30 ml bottle of eye drops, we can use a proportion based on the given concentration of 1 gram of Benzalkonium Chloride per 750 ml of liquid. 

Let's set up the proportion:

\[
\frac{1 \text{ gram}}{750 \text{ ml}} = \frac{x \text{ grams}}{30 \text{ ml}}
\]

We can solve for \( x \) (the amount of Benzalkonium Chloride needed) by cross-multiplying and dividing:

\[
x = \frac{1 \text{ gram} \times 30 \text{ ml}}{750 \text{ ml}}
\]

\[
x = \frac{30}{750}
\]

\[
x = \frac{1}{25}
\]

\[
x = 0.04 \text{ grams}
\]

Therefore, the pharmacist will need 0.04 grams of Benzalkonium Chloride for a 30 ml bottle of eye drops.

Would you like more details or have any questions?

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**Tip:** When solving proportion problems, always ensure the units on both sides of the equation match to avoid errors in calculation.

Discover how to calculate the amount of Benzalkonium Chloride needed for eye drops using proportions and unit conversions. This problem involves understanding concentration ratios and basic arithmetic. Suitable for students in Grades 6-8.

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