Save
ECHEM WATER HARDNESS pt2
Save
Share
Learn
Content
Leaderboard
Share
Learn
Created by
tai
Visit profile
Cards (17)
What is a chemical reaction that takes place between a metal ion and a molecular or ionic entity known as a ligand?
Complexation
View source
What is the central component of a complex compound?
Metal ion
View source
What type of molecules can act as ligands?
Neutral molecules or
ions
View source
What is a Lewis base?
A molecule that
donates
pairs of
electrons
View source
What is a chelate or chelating agent?
A substance that forms multiple bonds to a single
metal ion
View source
What is the meaning of the prefix "poly" in polydentate ligands?
Many
View source
What is the meaning of the suffix "-dentate" in polydentate ligands?
Toothlike
View source
What is an example of a polydentate ligand?
Ethylenediaminetetraacetic acid
(EDTA)
View source
What is the function of EDTA in reducing water hardness?
It forms bonds with
metal ions
, removing them from water
View source
What are the steps involved in complexometric titration?
Collection of water sample
Titration
using
EDTA
solution
Calculation of number of moles of EDTA used
Calculation of
number
of
moles
of
metal
ions (
Ca2+
) in the sample
Calculation
of
concentration
of Ca2+ in the sample in mol/L
Conversion of concentration to ppm of CaCO3
View source
What is the significance of the 1:1 ratio of EDTA ion to metal ion in the chemical reaction?
It allows for the calculation of the number of
moles
of metal ions in the sample
View source
What is a ligand?
A molecular or ionic entity that contains at least one atom with an
unshared pair of electrons
View source
What types of molecules can act as ligands?
Ions
or neutral molecules
View source
Why is EDTA important in water treatment?
It's used to reduce water hardness by forming bonds with metal ions, removing them from water
View source
What is a chelating agent?
A substance that forms (ring like structure) multiple bonds to a single metal ion
View source
Is EDTA biodegradable?
Yes
, but the process is considered
slow
View source
What are the environmental concerns related to EDTA?
It produces
CO2
and has a wide range of applications that may impact the natural environment
View source
See similar decks
14.5.2 Hardiness
AQA A-Level Psychology > Unit 14: Stress > 14.5 Individual Differences in Stress
16 cards
1.3.3 Water Purification
WJEC GCSE Chemistry > Unit 1: Chemical Substances, Reactions, and Essential Resources > 1.3 Water
54 cards
4.3 Water Security
OCR GCSE Geography > Unit 2: People and Society > 4. Resource Reliance
15 cards
2.2.1 Water
OCR A-Level Biology > Module 2: Foundations in biology > 2.2 Biological molecules
44 cards
3.2.1.2 Water
Edexcel GCSE Geography > Component 3: Geographical Investigations: Fieldwork and UK Challenges > 3.2 UK Challenges > 3.2.1 Resource Consumption and Environmental Sustainability
116 cards
7.2.3 The Water Cycle
AQA GCSE Biology > Unit 7: Ecology > 7.2 Organization of an Ecosystem
64 cards
Unit 5: The Water Cycle and Water Insecurity
Edexcel A-Level Geography
74 cards
1.8 Water
AQA A-Level Biology > 1. Biological Molecules
30 cards
1.1. The Water Cycle
AQA A-Level Geography > Component 1: Physical Geography > 1. Water and Carbon Cycles
34 cards
1.3. Water, Carbon, and Climate
AQA A-Level Geography > Component 1: Physical Geography > 1. Water and Carbon Cycles
56 cards
5.1 The Water Cycle
Edexcel A-Level Geography > Unit 5: The Water Cycle and Water Insecurity
38 cards
2.3.3 Water Resource Management
Edexcel GCSE Geography > Component 2: The Human Environment > 2.3 Resource Management
48 cards
1.3 Water
WJEC GCSE Chemistry > Unit 1: Chemical Substances, Reactions, and Essential Resources
110 cards
3.3.2 Water and mineral uptake
OCR A-Level Biology > Module 3: Exchange and transport > 3.3 Transport in plants
46 cards
2.2.2 Water Quality
AQA A-Level Environmental Science > 2. The Physical Environment > 2.2 The Hydrosphere
100 cards
1.2.1 The Water Cycle
OCR A-Level Geography > 1. Physical Systems > 1.2 Earths Life Support Systems
92 cards
2.2.1 Water Resources
AQA A-Level Environmental Science > 2. The Physical Environment > 2.2 The Hydrosphere
28 cards
7.2.3 The Water Cycle
GCSE Biology > Unit 7: Ecology > 7.2 Organization of an Ecosystem
48 cards
10.1 Using the Earth's resources and obtaining potable water
GCSE Chemistry > 10. Using resources
72 cards
1. Water and Carbon Cycles
AQA A-Level Geography > Component 1: Physical Geography
140 cards
4.1.2 Water Pollution
AQA A-Level Environmental Science > 4. Pollution > 4.1 Types of Pollution
52 cards