The next day, Dr. Marie received a batch of water samples for analysis. The treatment facility that provides tap water a

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The next day, Dr. Marie received a batch of water samples for
analysis. The treatment facility that provides tap water along
Jack Street, where Dr. Marie lives, wanted to know if they are
still able to maintain the appropriate water hardness after they
made some replacements to their filtration and purification
systems. Marie then performed complexometric titration to meet the
facility’s needs, her data for which are summarized below.

The Next Day Dr Marie Received A Batch Of Water Samples For Analysis The Treatment Facility That Provides Tap Water A 1 (21.04 KiB) Viewed 14 times

Conc. Ca Std (M) Trist 1 2 3 Trial 1 2 3 0.01054 TABLE 1. Density of Ca²+ Standard Vakume Cal Std (n 10.00 1242 11.20 TABLE 2. Standardization of EDTA Volume C² Std.) 5.30 5.15 5.03 MM CaCO, /mal) Trial 1 Mass Ca Std (g) 9.97 12.27 11.03 Mass of EDTA (g) Trial 5.25 1 503 2 487 3 TABLE 5. Hardness Classification Description Soft Moderately Hand Hard Very Hard 2 3 ppm CaCO -60 61-120 121-180 > 180 100.09 TABLE 3. Titration data @ pH-10 Mass sample [g) 50.24 50,04 50.68 TABLE 4 Titration data @pH-13 Mass sample (a) 50.16 50.25 50.32 Mass EDTA) 5.34 5.12 5.33 Miss EDTA (8) 4.19 4:21 4.23