6 ml of water used (5 ml of tap water 1ml of buffer)     Hard Water Trial 1 Hard Water Trial 2 Hard Water Trial 3 Initial Syringe Reading (mL) 2ml 2ml 2ml Final Syringe Reading (mL) .61ml .69ml .58ml Volume of EDTA Consumed (mL) 139ml 131ml 142ml Water Hardness ppm CaCO3 (mg/L)         Average ppm CaCO3 (mg/L)

Chemistry for Engineering Students
4th Edition
ISBN:9781337398909
Author:Lawrence S. Brown, Tom Holme
Publisher:Lawrence S. Brown, Tom Holme
Chapter3: Molecules, Moles, And Chemical Equations
Section: Chapter Questions
Problem 3.27PAE
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Data Table 2: Complexometric Titration of Tap Water

photo shows equation to find water hardness 

6 ml of water used (5 ml of tap water 1ml of buffer)

 

 

Hard Water Trial 1

Hard Water Trial 2

Hard Water Trial 3

Initial Syringe Reading (mL)

2ml

2ml

2ml

Final Syringe Reading (mL)

.61ml

.69ml

.58ml

Volume of EDTA Consumed (mL)

139ml

131ml

142ml

Water Hardness

ppm CaCO3 (mg/L)

 

 

 

 

Average ppm CaCO3 (mg/L):

mL EDTA
1 L
0.01 mol EDTA
1 mol CaCO,
mol CaCO,
%3D
1
1,000 mL
1 L
1 mol EDTA
1,000 mg
100.1 g CaCO,
1 mol CaCO,
1,000 mL
mol CaCO,
mL Water Sample
mg/L CaCO,
%3D
1 g
1 L
mg/L CaCO,=_ppm CaCO,
continued on next
Transcribed Image Text:mL EDTA 1 L 0.01 mol EDTA 1 mol CaCO, mol CaCO, %3D 1 1,000 mL 1 L 1 mol EDTA 1,000 mg 100.1 g CaCO, 1 mol CaCO, 1,000 mL mol CaCO, mL Water Sample mg/L CaCO, %3D 1 g 1 L mg/L CaCO,=_ppm CaCO, continued on next
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