This document presents information on the hardness of water, including its constituents, occurrence, structure, types (temporary and permanent), methods of determination (soap solution and EDTA methods), units of measurement in terms of calcium carbonate, and effects. Hardness is caused by calcium and magnesium ions which reduce the lathering ability of soap. There are two types - temporary (removed by boiling) and permanent. Methods to determine hardness involve titrating water samples against soap or EDTA solutions.
Generally hardness of water is defined as the measure of capacity of water to precipitate soap i.e., the capacity of the water to form lather with soap.
Hard water contains dissolved minerals such as Ca2+, Mg2+, Fe3+, SO4 2- ,etc.,
The degree of hardness is measured in Parts Per Million(ppm) or Grams per Gallon(GPG).
Hard water is better for drinking because it contains minerals.
Soft water is better for cleaning because it doesn’t form scum with soap.
Hardness of water is a measure of the total concentration of the calcium and magnesium ions expressed as calcium carbonate.
There are two types of hardness
1. Temporary hardness
Temporary Hardness is due to the presence of bicarbonates of calcium and magnesium. It can be easily removed by boiling.
Ca (HCO3 ) CaCO3 +CO2 +H2O
2. Permanent hardness
Permanent Hardness is due to the presence of chlorides and sulphates of calcium and magnesium. This type of hardness cannot be removed by boiling.
Generally soaps create foam in water, but in present of some materials the foam creation is reduced and need more soap for producing foam, and this condition of water is called water hardness.
The presence of Calcium, Magnesium salt i.e. bicarbonates, sulphates, chloride in water is called causes of hardness of water. The water which contains these salts is called hard water. Hard water does not easily form lather with soap as the salt of Calcium and Magnesium react with soap to form insoluble organic salts.
Generally hardness of water is defined as the measure of capacity of water to precipitate soap i.e., the capacity of the water to form lather with soap.
Hard water contains dissolved minerals such as Ca2+, Mg2+, Fe3+, SO4 2- ,etc.,
The degree of hardness is measured in Parts Per Million(ppm) or Grams per Gallon(GPG).
Hard water is better for drinking because it contains minerals.
Soft water is better for cleaning because it doesn’t form scum with soap.
Hardness of water is a measure of the total concentration of the calcium and magnesium ions expressed as calcium carbonate.
There are two types of hardness
1. Temporary hardness
Temporary Hardness is due to the presence of bicarbonates of calcium and magnesium. It can be easily removed by boiling.
Ca (HCO3 ) CaCO3 +CO2 +H2O
2. Permanent hardness
Permanent Hardness is due to the presence of chlorides and sulphates of calcium and magnesium. This type of hardness cannot be removed by boiling.
Generally soaps create foam in water, but in present of some materials the foam creation is reduced and need more soap for producing foam, and this condition of water is called water hardness.
The presence of Calcium, Magnesium salt i.e. bicarbonates, sulphates, chloride in water is called causes of hardness of water. The water which contains these salts is called hard water. Hard water does not easily form lather with soap as the salt of Calcium and Magnesium react with soap to form insoluble organic salts.
Infomatica, as it stands today, is a manifestation of our values, toil, and dedication towards imparting knowledge to the pupils of the society. Visit us: http://www.infomaticaacademy.com/
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Infomatica, as it stands today, is a manifestation of our values, toil, and dedication towards imparting knowledge to the pupils of the society. Visit us: http://www.infomaticaacademy.com/
Manufacturing of chlorine using diaphragm cell, membrane cellrita martin
Chlorine is an important industrial chemical. Chlorine is manufactured by the electrolysis of sodium chloride solution using a diaphragm cell and a membrane cell. Both cells rely on the same underlying chemistry, but differ in detail.
Synthesis of tris (thiourea) copper (i) sulphate by kwezi mwaka juliusMakerere University
its a well described report on SYNTHESIS OF TRIS (THIOUREA) COPPER (I) SULPHATE and this serves to industrial chemistry students doing transition metal chemistry.
This Presentation Clarifying about potable Water analysis and their methods which i gave training on operation and maintenance team for Oman Al Ghubrah Independence Water Project (SWRO Desalination 42 MIGD)
This experiment involves a comparison between the thermal stabilities of carbonates of reactive metals, such as sodium and potassium, and the carbonates of less reactive metals, such as lead and copper
Thermal decomposition, or thermolysis, is a chemical decomposition caused by heat. The decomposition temperature of a substance is the temperature at which the substance chemically decomposes.
The reaction is usually endothermic as heat is required to break chemical bonds in the compound undergoing decomposition. If decomposition is sufficiently exothermic, a positive feedback loop is created producing thermal runaway and possibly an explosion.
All the carbonates in this Group undergo thermal decomposition to give the metal oxide and carbon dioxide gas. Thermal decomposition is the term given to splitting up a compound by heating it.
All of these carbonates are white solids, and the oxides that are produced are also white solids.
Hydrogen, the most abundant element in the universe and the third most abundant on the surface of the globe.
All you have to know about this inflammable gas.
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2. ACKNOWEDGEMENT
I owe a great many thanks to a great many people who
helped and supported me during the writing of this
assignment.
My deepest thanks to lecturer, the guide of the project, for
guiding and correcting various documents of mine with
attention and care.
I would also thanks my institution and my faculty members
without whom this project would have been a distant
reality. I also extend my heartfelt thanks to my family and
well wishers.
3. Constituents-
2 elements of
H2
1 element of
O2
3 states of
water-
Solid, Liquid & Gas
Occurrence-
Most abundant
& widely
distributed
3/4th of
Earth’s crust
4.
5. STRUCTURE
• H20 is Polar i.e. ,it is partially charged
• O2 has higher Electronegativity
• H2O is a solvent
• Forms 104.5deg angle
• Bent shape/V-shape structure
• H-bonding
6. HARDNESS OF WATER
Soap consuming power of water is called Hardness.
Ca2+/Mg2+ cationsCause Hardness
SoapSodium/Potassium salts of oleic acid,
palmitic acid, stearic acid.
2C17H35COONa + CaCl2 (C17H35COO)2Ca +2NaCl
(Sodium stearate)
2C17H35COONa + Ca(HCO3)2 (C17H35COO)2Ca + 2NaHCO3
Calcium stearate
(Insoluble salt)
7. There are two types of hardness-
Temporary hardness
Permanent hardness
1>Temporary hardness-
~it is due to the presence of soluble salts of HCO3-
of Ca & Mg.
~it can be removed by boiling. In this the HCO3- are
decomposed into insoluble CO32-
Ca(HCO3)2CaCO3 + H2O + CO2
(soluble) (insoluble)
8. 2. Permanent hardness
It is due to sulphides,chlorides &
nitrates of calcium, magnesium & other metals.
CLASSIFICATION OF HARDNESS
Alkaline hardness Non-alkaline hardness
carbonates,bicarbonates chlorides,sulphides &.
& hydroxides of metals nitrates of metals
9. 1.SOAP SOLUTION METHOD:
Ca(HCO3)2+2C17H35COONa(C17H35COO)2Ca +NaHCO3
Ca bicarbonate sodium stearate Ca stearate
CaCl2 +2C17H35COONa(C17H35COO)2Ca+2NaCl
CaSO4+2C17H35COONa(C17H35COO)2Ca+Na2SO4
10. Hardness causing metal ions get
precipitated.
When more sodium salt is added, lather
is formed.
The aliquot is titrated against standard
soap solution in alcohol.
End point indicates total hardness.
The aliquot is boiled for 30 mins.
Temporary hardness get removed(may
be due to the formation of CO2 which
escapes)
12. Boil the aliquot for 30mins
Temporary hardness is removed
The remaining again titrated against
Na2[EDTA]H2 complex
End point indicates permanent hardness
{Total hardness-Permanent hardness=temporary
hardness}
13. Blockage of passage occurs when water is used for
cooling due to scale deposition.
Hard water is harmful for drinking as it causes
deposition of calcium in the bone joints.
It causes formation in boilers and pipes.
Hard water does not form any lather with soaps or
detergents.
14. Hard water is calculated in terms of calcium
carbonate. It is because of the following reasons:
Molecular weight of CaCO3 is:
40+12+16x3=100
Most insoluble salt of Ca which is precipitated
during water treatment processes.
Equivalent of CaCO3 =
=[Mass of hardness producing substance x chemical equivalent of CaCO3
Chemical equivalent of hardness producing substance
= [Mass of hardness producing substance in mg/L]x multiplication factor