Civil PE Exam - Water Resources Depth - Find the Total Hardness for a Water Sample

Today, Matt Fanghella solves a heavy problem for the Water Resources depth section of the Civil PE Exam. It deals with calculating the hardness in mg/L as calcium carbonate of a water sample. Try to do it on your own first, then jump back in and let's solve it together. 😉
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[@BolfSwagg]

so were suppose to memorize this formula?

[@CivilEngAcademy]

Yes

[@LeonardoUV]

Why we did not include the bicarbonate HCO3? I thought that contribute to carbonate hardness