This document discusses the manufacture and properties of sodium and several other compounds. It describes the electrolysis process used to extract sodium from molten NaCl, lowering the melting point with CaCl2. Sodium is collected at the cathode and chlorine at the anode. The document also summarizes processes for manufacturing sodium carbonate, sodium hydroxide, magnesium sulfate, gypsum, plaster of paris, and bleaching powder. Their properties and uses are provided.
3 modren sodium hydroxide manufacturing methodsrita martin
Sodium hydroxide also known as caustic soda with chemical formula NaOH found in many forms caustic soda lye, flakes, granules and solid. Produced using three different process Mercury Cell, Diaphragm cell, Membrane Cell methods
6 methods of preparation of caustic sodarita martin
Sodium hydroxide, also known as caustic soda or lye, is an inorganic compound with the chemical formula NaOH. It is a white solid, and is a highly caustic metallic base and alkali salt. It is available in pellets, flakes, granules, and as prepared solutions at a number of different concentrations.
Manufacturing of sodium carbonate using solvay processrita martin
Solvay Process majorly used in sodium carbonate industrial production was discovered by belgian industrial chemist Ernest Solvay which uses three readily available materials salt brine, limestone, ammonia
3 modren sodium hydroxide manufacturing methodsrita martin
Sodium hydroxide also known as caustic soda with chemical formula NaOH found in many forms caustic soda lye, flakes, granules and solid. Produced using three different process Mercury Cell, Diaphragm cell, Membrane Cell methods
6 methods of preparation of caustic sodarita martin
Sodium hydroxide, also known as caustic soda or lye, is an inorganic compound with the chemical formula NaOH. It is a white solid, and is a highly caustic metallic base and alkali salt. It is available in pellets, flakes, granules, and as prepared solutions at a number of different concentrations.
Manufacturing of sodium carbonate using solvay processrita martin
Solvay Process majorly used in sodium carbonate industrial production was discovered by belgian industrial chemist Ernest Solvay which uses three readily available materials salt brine, limestone, ammonia
Chemical industries are established to meet the needs of modern societies. The manufacturing of sodium carbonate through the Solvays process will be discussed in detail.
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/
Soft, hard and heavy water, by Saliha Rais, for grade 9.Saliha Rais
The slide show includes the following topics:
1. hard water
2. soft water
3. causes of hardness of water
4. types of hardness (temporary and permanent)
5. methods to remove temporary hardness (heating and clarks method)
6. methods to remove permanent hardness (with washing soda, caustic soda and zeolite)
7. Heavy water
8. hygroscopic and deliquescent substances
I have made this presentation for grade 9 students.
Major industrial applications of sodium carbonaterita martin
Sodium carbonate also known as soda ash, washing soda most basic industrial chemicals produced from trona ore used in manufacture of glass, paper, soaps detergents, water softening
Chemical industries are established to meet the needs of modern societies. The manufacturing of sodium carbonate through the Solvays process will be discussed in detail.
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/
Soft, hard and heavy water, by Saliha Rais, for grade 9.Saliha Rais
The slide show includes the following topics:
1. hard water
2. soft water
3. causes of hardness of water
4. types of hardness (temporary and permanent)
5. methods to remove temporary hardness (heating and clarks method)
6. methods to remove permanent hardness (with washing soda, caustic soda and zeolite)
7. Heavy water
8. hygroscopic and deliquescent substances
I have made this presentation for grade 9 students.
Major industrial applications of sodium carbonaterita martin
Sodium carbonate also known as soda ash, washing soda most basic industrial chemicals produced from trona ore used in manufacture of glass, paper, soaps detergents, water softening
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The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
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The Roman Empire, a vast and enduring power, stands as one of history's most remarkable civilizations, leaving an indelible imprint on the world. It emerged from the Roman Republic, transitioning into an imperial powerhouse under the leadership of Augustus Caesar in 27 BCE. This transformation marked the beginning of an era defined by unprecedented territorial expansion, architectural marvels, and profound cultural influence.
The empire's roots lie in the city of Rome, founded, according to legend, by Romulus in 753 BCE. Over centuries, Rome evolved from a small settlement to a formidable republic, characterized by a complex political system with elected officials and checks on power. However, internal strife, class conflicts, and military ambitions paved the way for the end of the Republic. Julius Caesar’s dictatorship and subsequent assassination in 44 BCE created a power vacuum, leading to a civil war. Octavian, later Augustus, emerged victorious, heralding the Roman Empire’s birth.
Under Augustus, the empire experienced the Pax Romana, a 200-year period of relative peace and stability. Augustus reformed the military, established efficient administrative systems, and initiated grand construction projects. The empire's borders expanded, encompassing territories from Britain to Egypt and from Spain to the Euphrates. Roman legions, renowned for their discipline and engineering prowess, secured and maintained these vast territories, building roads, fortifications, and cities that facilitated control and integration.
The Roman Empire’s society was hierarchical, with a rigid class system. At the top were the patricians, wealthy elites who held significant political power. Below them were the plebeians, free citizens with limited political influence, and the vast numbers of slaves who formed the backbone of the economy. The family unit was central, governed by the paterfamilias, the male head who held absolute authority.
Culturally, the Romans were eclectic, absorbing and adapting elements from the civilizations they encountered, particularly the Greeks. Roman art, literature, and philosophy reflected this synthesis, creating a rich cultural tapestry. Latin, the Roman language, became the lingua franca of the Western world, influencing numerous modern languages.
Roman architecture and engineering achievements were monumental. They perfected the arch, vault, and dome, constructing enduring structures like the Colosseum, Pantheon, and aqueducts. These engineering marvels not only showcased Roman ingenuity but also served practical purposes, from public entertainment to water supply.
2024.06.01 Introducing a competency framework for languag learning materials ...Sandy Millin
http://sandymillin.wordpress.com/iateflwebinar2024
Published classroom materials form the basis of syllabuses, drive teacher professional development, and have a potentially huge influence on learners, teachers and education systems. All teachers also create their own materials, whether a few sentences on a blackboard, a highly-structured fully-realised online course, or anything in between. Despite this, the knowledge and skills needed to create effective language learning materials are rarely part of teacher training, and are mostly learnt by trial and error.
Knowledge and skills frameworks, generally called competency frameworks, for ELT teachers, trainers and managers have existed for a few years now. However, until I created one for my MA dissertation, there wasn’t one drawing together what we need to know and do to be able to effectively produce language learning materials.
This webinar will introduce you to my framework, highlighting the key competencies I identified from my research. It will also show how anybody involved in language teaching (any language, not just English!), teacher training, managing schools or developing language learning materials can benefit from using the framework.
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Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
4. The cell is composed of and iron box lined
with fire bricks. The cell is fitted with a
central graphite anode and a surrounding
cathode the two electrodes are separated
by a cylindrical iron gauze diaphragm,
which screens the graphite anode from the
ring shaped iron cathode. This keeps away
the molten sodium metal from gaseous
chlorine.
5. In this process a mixture of NaCl and CaCl2
is electrolyzed. Ca Cl2 lowers the melting
point of NaCl from 801oC to 600oCNa is
collected at cathode and Cl2 at anode.
Some Ca ions are also Collected at cathode
but Ca being much denser than Na, does
not mix with it and cane be separated
easily.
6. Reaction at cathode
Reaction at anode
Over all reaction
7. OCCURRENCE
It occurs in nature as “rock salt” at
khewra, it also occur in sea water upto 3%.
It occurs in the form of “Brine” a super
saturated solution of NaCl from mines and
sea water.
8. It is obtained by solar evaporation of sea
water. The sea water contains Mg and Ca as
impurities. they are treated with to get Na Cl
PROPERTIES:
It is colorless crystalline solid.
It has a face centered cubic structure
It is soluble in water
It boiling point is 1440oC
It reacts with H2 SO4 to produce HCl.
9. It is an essential part of our daily diet
It is used as food preservative.
It is used in the manufacture of Na metal, Cl2
gas and other chemicals eg
It is used in regeneration of water softener
and in salting out of soap.
It is used in refrigeration in the form of
freezing mixture with ice.
10. This process is used to manufacture
following compounds.
Sodium carbonate or soda ash, Na2CO3
sodium carbonate deca hydrate or washing
soda Na2CO3 .10H2O and
sodium hydrogen carbonate or baking soda
NaHCO3
11. Raw material used and their sources
Brine or aq; NaCl: it is natural source of
NaCl
CO2 it is obtained by heating limestone
Ammonia : it is recovered from NH4 Cl
12. The process involves three steps.
Ammoniation of Brine
Carbonation of Ammoniated Brine
Conversion to sodium carbonate
13. Step No. 1:-
In this step Brine (NaCl) is saturated with NH3 gas and is
allowed to flow down in ammoniating tower where the
flow controlled.
Step No. 2:-
In this step ammoniated brine is mixed with CO2 gas to
produce NH 4
+ and HCO3
- ions in carbonation tower.
NH3 + CO2 + H2O (NH4) 2CO3
(NH4)2CO3 + CO2 + H2O 2NH4HCO3
Then NH4HCO3 reacts with Na Cl (brine) to precipitate
less soluble NaHCO3 and NH4Cl. Lower part of tower is
coated and NaHCO3 is removed by vacuum filtration and
washed to free of ammonium salts.
14. Step No. 3:- In this step Sodium
bicarbonate is heated to give anhydrous
sodium carbonate, which is called soda
ash.
NaHCO3 Na2CO3 + CO2 + H2O
This soda ash is re-crystallized from hot
aqueous solution and washing soda
Na2 CO3.10H2O is formed.
Na2CO3 + 10H20 Na2CO3.10H20
15.
16. Reaction with carbon dioxide :
By passing CO2 through aqueous solution of Na2CO3
we get NaHCO3
Na2CO3+CO2 + H2O 2NaHCO3
With silica (sand) : When Na2CO3 reacts with sand,
water glass is produced.
Na2CO3+SiO2 Na2SiO3+CO2
With lime Ca(OH)2:- When Na2 CO3 reacts with lime
caustic Soda is obtained.
Na2CO3+ Ca(OH)2 CaCO3+NaOH
17. It is used to manufacture water glass and as
water softener.
It is used in making of soap, paper,
detergents, Na OH etc
It is used in textile industry and petroleum
refinery.
Sodium Hydrogen Carbonate (NaHCO3)
Baking soda
18.
19. Two chambers
In first, chlorine is obtained and in second
caustic soda is formed
Anode; Titanium or graphite
Cathode; Flowing Mercury
Electrolyte; Brine (saturated solution of
sodium chloride)
20. At anode;
2Cl- Cl2
At cathode;
Na+ + e- Na
Na + Hg Na/Hg (amalgam)
Na/Hg + H2O NaOH + Hg + H2
21. Efficient process and gives product of high
purity
Possible reaction between chlorine and
caustic soda is avoided by using two different
chambers
Mercury can be re-used
Hydrogen can not be discharged at Hg
cathode due electrode potential difference
22. In spite of strict control some mercury
vapous escape from plant and contaminate
the food chain
It consumes large amount of electricity
23. it is white crystalline Solid
its Melting Point is 3220C
it is highly soluble in water
it has soapy touch even in dilute solution
and is bitter in taste.
it is deliquescent and translucent solid
24. With acid:-
it is strong alkali, turns red litmus paper blur and
neutralized to acids.
HCl + NaOH NaCl + H2O
With CO2 :-
Na OH absorbs atmospheric CO2 producing sodium
carbonate and H2 O
2NaOH + CO2 Na2 CO3 + H2O
With Ammonium chloride: -
NaOH reacts with ammonium salt on warning and
librating ammonia.
NH4 Cl +NaOH NaCl +NH3 + H2O
With FeCl3 :-
NaOH reacts with FeCl3 to give reddish brown ppt of
ferric hydroxide
3NaOH + FeCl3 Fe(OH)3 +3 NaOH
25. it is used in preparation of Phosphine, Na
compounds.
it is used in manufacture of soap, paper,
petroleum
it is used in Purification of bauxite, in
bleaching dying process in mercerizing
(silky Finish) of Cotton and rayon
26. Magnesium Sulphate Or (Epsom Salt)
MgSO4.7H2O
Hepta Hydrate Magnesium Sulphate
Gypsum (Calcium Sulphate dihydrate)
CaSO4.2H2O
Plaster of Paris (Calcium sulphate hemi
hydrte)
CaSO4.1/2H2O or (CaSO4)2. H2O
Bleaching Powder CaOCl2
27. OCCURRENCE:-
It occurs in nature as an ore which is
known as kieserite (MgSO4.H20)
PREPARATION:-
It is prepared by the action of sulphuric
acid with magnesium metal magnesium oxide
Mg (0H)2 magnesium carbonate.
Mg + H2SO4 →MgSO4 +H2
MgO + H2SO4 →MgSO4 +H2O
Mg(OH)2 + H2SO4 →MgSO4 +2H2O
MgCO3 + H2SO4 →MgSO4 +H2O + CO2
28. PROPERTIES
it is colorless crystalline solid.
It is soluble in water
When heated crystalline Epsom loses water
and form anhydrous magnesium sulphate.
USES:-
It is used in medicines as mild purgative
It is used in the following industries
(a) cement (b)soap (c)paper (d)ceramics
(e)cotton textile (f)dyes (g)paper
29. OCCURANCE:-
It occurs as anhydrous calcium
sulphate Ca SO4 and as dihydrate Ca SO4.
2H2O Gypsum is found in Pakistan in
abundance
Properties
It is sparingly soluble solid and produces permanent hardness in water.
At higher temperature gypsum loses all the water of crystallization to
give anhydrous calcium sulphate, on heating at 100oC it changes to
hemihydrate form called plaster of Paris.
2[CaSO4 .2H2O] (CaSO4)2.H2O+3H2O
30. USES:-
Plaster of Paris when mixed with water, sets
in five minutes to a hard mass. This setting
takes place with expansion.
This property permits to use in preparation
of moulds in surgery and castings.
It is used for making plaster for walls
and floor
31. EMPIRICAL FORMULA:-
Professor Odling in 1861 suggested
empirical formula of bleaching powder as
CaOCl2 or Ca(OCl)Cl
Preparation
It is prepared by Hasen Clever plant
Ca(OH)2 + Cl2 CaOCl2 + H2O
32.
33. Reaction with water
CaOCl2 + H2O Ca(OH)2 + Cl2
Reaction with Hydrochloric acid
CaOCl2 + HCl CaCl2 + H2O + Cl2
Reaction with moist Carbon dioxide:
CaOCl2 + CO2 + H2O CaCO3 + CaCl2 + HOCl
USES:
It is used in textile and other industries as an
oxidizing and bleaching agent.
It is used in the purification of drinking water
It is also used as disinfectant in showers and
drains