Medical definition of narrow-spectrum: effective against only a limited range of organisms effective against only a limited range of organismsâ¦ See the full definition
If your baby is younger than 4 months, Health Canada recommends boiling the water for use in mixing formula for 2 minutes.
1 Answer 1. You can prepare a solution of FeClX3 by dissolving the appropriate amount in water. Let's say you want a 0.1 M solution of FeClX3. You would do this by dissolving 0.1 mole of FeClX3 in 1 liter of water. You would need to dissolve 16.22 g of FeClX3 in enough water to make 1 liter of solution. This solution is not stable over time. $\ce{FeCl3}$ hydrolyzes in water. See my answer to this question. The hydrolysis can be slowed/reversed by adding $\ce{HCl}$. Since solutions of $\ce{FeCl3}$ are already acidic, there is no harm usually in adding more acid.