PE Exam Practice Problem #24: Water Resources | Env. Eng. - Hardness - Water Softening - Bar Chart

Welcome to SolvedIn6: Free practice problems for the Professional Engineering Exam! Each question is styled after those created by the NCEES, and is usually solved in under 6 minutes, which is the average time you will have to solve each question on the Professional Engineering Exam.

Today's problem covers water hardness and bar charts. These could also be topics on the Environmental Engineering exam. The reference manual will not be of much help for this question, so make sure you remember how to solve this type of question before going into the exam. A few basic things to remember:
Carbon Dioxide does not contribute to hardness, but it does consume lime.
Carbonate hardness is the lower of 2 numbers - the total hardness, or the alkalinity.
Total Hardness is the sum of calcium and magnesium.
Alkalinity is the calcium and magnesium that overlaps with bicarbonate.

Another great video to check out related to this topic can be found here:

If you would like more Water Resources practice problems, please check out the rest of the playlist which this video is part of.

Please note that newer versions of the reference manual may have been released since this video was recorded. The search terms are usually still correct, but the page numbers listed in the video will be different.

[ryanhanson]

I just took the water resource exam 2 weeks ago and a question very similar to this was on it (except the box was not given). Great content. Just wanted to circle back to let you know that it was great watching your videos before my exam. It may have helped me PASS.