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Hardness of water experiment lab report

09/01/2021 Client: saad24vbs Deadline: 14 Days

Copyright 2019 - Hands-On Labs | http://holscience.com 1 / 4


Student Name


Mohammed Alnaimi


Student ID 48408 Lesson Determination of Water Hardness Using a Titrator Institution Ocean County College Session 2019L2 CHEM 181 DL1 Course CHEM 181 DL1 Instructor Lea Stage


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.


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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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