2 18. Which of the following is the best practice when di-
luting a strong acid with water?
1. Fill a beaker with at least half of the required dilu-
tion water, then add the acid, and mix
2. Place the acid in an empty beaker on a magnetic
stirrer, turn on the mixer, and then add water
3. Place half of the acid in an empty beaker, add half
of the required water, then add the remaining acid,
mix, and fill to the desired volume with water
4. Add baking soda to the strong acid (1:10), then
add water to the desired final volume, and mix