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Determination of water hardness by edta titration calculations

13/11/2021 Client: muhammad11 Deadline: 2 Day

Final Report

Exercise 1

CHEM 181 DL1 Determination of Water Hardness Using a Titrator

Because our calculations came out to 333.2ppm for the water hardness I would classify the water as very hard. Anything above 180 ppm is very hard water.

1. Based on the analysis of your local water, would you classif y its hardness as sof t, moderate, hard, or very hard? Explain your answer.

8oz x 8 oz =64 oz x 29.57mL= 1892mL=1.9Lx333.2mg/L=632.7mg

2. Approximately how much calcium would you ingest by drinking eight 8-oz glasses of your local water? Hint: 1 oz (f luid ounce) = 29.57 mL.

Copyright 2019 - Hands-On Labs | http://holscience.com 2 / 4

Data Table 1: EDTA Titration Volume

8oz x 8 oz =64 oz x 29.57mL= 1892mL=1.9Lx333.2mg/L=632.7mg

3. Assume an average minimum daily requirement for calcium is 1,150 mg. Calculate what percentage of your daily requirements could be met by drinking 1.0 L of your local water.

Copyright 2019 - Hands-On Labs | http://holscience.com 3 / 4

Data Table 2: Water Hardness

Trial Initial EDTA Volume (mL)

1

2

3

Trial Final EDTA Volume (mL)

1

2

3

Average Volume of EDTA Used (mL)

Trial Total Volume EDTA Used (mL)

1

2

3

10

11

13

7.5

6.5

10

2.5

4.5

3

3.33

Copyright 2019 - Hands-On Labs | http://holscience.com 4 / 4

Average Volume of EDTA Used (mL)

Concentration Ca Ions Per Liter of Water (mol/L)

Average Volume of EDTA Used (mL)

Water Hardness (ppm CaCO )

2+

3.33 0.00333

3

3.33 333.2

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