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Arrhenius’s Theory And Ostwald's Dilution Law
Arrhenius's theory is based on the colligative properties of solutions of acids, bases and salts. The theory of electrolyte dissociation was observed in the ionisation of water higher than sodium chloride and potassium chloride. Ostwald’s dilution law is based on the Arrhenius theory, which is related to the variation of the degree of ionisation of an electrolyte.
Table of Contents:
- What is Arrhenius's Theory?
- Degree Of Ionisation Or Dissociation
- Factors Affecting Ionisation Or Dissociation
- Electrolyte
- Ostwald's Dilution Law
- Limitations Of Ostwald’s Dilution Law
- Practice Problems On Arrhenius’s Theory And Ostwald's Dilution Law
- Frequently Asked Questions
What is Arrhenius Theory?
Arrhenius's theory was introduced by Swedish scientist Svante Arrhenius in the year 1887. This theory states that the acids dissociate in the water and produce electrically charged ions, of which hydrogen ion (H+) is one. Similarly, bases dissociate in water producing hydroxide ions (OH−). Thus it states the splitting of acid or base into ions in solution.
This process is reversible and induces electrical conductivity, elevates boiling point, and reduces vapour pressure and osmotic pressure.
Degree Of Ionisation Or Dissociation
The degree of dissociation is calculated by the ratio of the total number of molecules which is ionised at the equilibrium state.
Factors Affecting Ionisation Or Dissociation
- If the nature of the electrolyte is stronger, then there is more ionisation.
- If the dielectric constant of the solvent is higher, then there is more ionisation.
- The lesser the concentration of the solution, the more the ionisation.
- The higher the temperature of the solution, the more the ionisation.
- The more solvation, the more ionisation.
- If there are common ions present in the solution, then the ionisation decreases.
- The more solvation, the more ionisation.
Electrolyte
A substance that separates the ions in the solution is called an electrolyte. An electrolyte can be an acid, base or salt.
- Strong electrolyte: This electrolyte dissociates completely into ions though it is in a concentrated solution. For example, NaOH, KOH, HCl, NaCl, etc. Most of the salts are always strong electrolytes.
- Weak electrolyte: This electrolyte dissociates only to a small extent in a solution. For example, CH3COOH, NH4OH, etc.
Ostwald's Dilution Law
Ostwald's dilution law refers to the weak electrolyte’s dissociation constant with respect to the degree of dissociation. The law states that “The degree of dissociation of a weak electrolyte is inversely proportional to the square root of molar concentration or directly proportional to the square root of volume holding one mole of the solute for a weak electrolyte.” This applies only to weak electrolytes such as CH3COOH ( Acetic acid). The equation of Ostwald’s dilution law is given as follows:
Limitations Of Ostwald’s Dilution Law
- Ostwald’s dilution law is applicable only to weak electrolytes, while it is completely not applicable to strong electrolytes.
- Ostwald’s dilution law is based on Arrhenius's theory. Thus, only some fraction of electrolytes are dissociated at normal dilution, but it is completely dissociated in infinite dilution. The strong electrolytes are completely dissociated at all dilutions, therefore does not give an accurate value of the degree of dissociation.
- The law has applied the law of mass action; thus, a simple form of the law of mass action can not be applied in such a case.
- The ions that are dissociated might be hydrated by the water molecules, which can alter the ion's concentration.
Practice Problems On Arrhenius's Theory And Ostwald's Dilution Law
Q1. Which of the following is a weak electrolyte?
a. CH3COOH
b. NaOH
c. HCl
d. KOH
Ans: CH3COOH
Q2. Which of the following is a strong electrolyte?
a. CH3COOH
b. NaOH
c. NH4OH
d. None of the above
Ans: b. NaOH
Q3. Which of the following is correct about Ostwald's dilution law?
Frequently Asked Questions
Q1. What is ionisation?
Answer: Ionisation is a process in which an atom or molecule is charged into positive or negative charge by either gaining or losing electrons.
Q2. What is dissociation?
Answer: Dissociation is a process in which the substance spontaneously splits into constituent charged particles. It is reversible in nature.
Q3. What is the equation for Ostwald's dilution law?
Answer: The equation for Ostwald's dilution law is given as 
.
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Parallelogram, Trapezium and Kite Cumulative Frequency Distribution Ratio to Percentage Factors of 98 Total Probability Theorem Commutative Property Basic Set Theory Difference Between Area and Surface Area Identity Function Geometric Distribution Combination Sum of Squares Factors of 25 Triangle Inequality Complement of a Set Factor of 105 Arc Categorical Data Construction of a Rhombus Hexadecimal to Octal Conversion Decimal Expansion of Rational Numbers Distance Between Two Points Estimation of Numbers Multiplication Theorem of Probability Properties of Definite Integrals Right Angle Triangle Theorem Section Formula in 3 Dimension Solids Trigonometric Equations Variance and Standard Deviation Disjoint Set Application of Linear Equations Area and Perimeter Factors of 91 Concave Polygon Factors of 42General Equation of a Line
Factors of 100 Factors of a NumberMultiplicative Inverse
Linear Differential Equations
Inverse Cosine
Comparing Quantities using Percentage
Fractional Part Function Definition of Signum function Trigonometric Functions Ellipse Integration By Parts Sets Matrix Types of Sets Bijective Functions Algebra of Functions Composite Functions Binary Operations Domain Codomain & Range Functions Parametric Equation of a Circle Venn Diagram Tangent to a Circle Binomial Theorem L'Hospital Rule Relations Operation on Sets Particular Cases of a Circle Terms Related to an Ellipse Equality of Matrices Reflexive, Symmetric & Equivalence Relation Types of Functions Matrix Multiplication Tangents to an Ellipse Inverse Trigonometric FunctionsActive Transport Adaptive radiation evolution Aerobic and Anaerobic Respiration Agricultural Implements Algae Alimentary Canal Anatomy Angiosperms And Gymnosperms Difference Animal Cell Apiculture Beekeeping
Apoplast
Asexual Reproduction Animals Autotrophic Nutrition Biodiversity Biotic and AbioticBryophyta
Budding Camouflage Cattle Farming Animal Husbandry Cell Structure and Function Cell Wall and Cell Membrane Cells Chloroplasts Chromatin Classification of Animal Kingdom Composition of Lymph Conduction of Nerve Impulse Cyclic and Non Cyclic Cyclic Photophosphorylation Cytoplasm Structure Function Difference Between Active and Passive Transport Difference Between Archaea And Bacteria Difference Between Blood And Lymphth Difference Between Cerebellum And Cerebrum Difference Between Chromosome And Chromatid Difference Between Diffusion and Osmosis Difference Between DNA and RNA Difference Between Haploid And Diploid Difference Between Plant Cell and Animal Cell Difference between Renewable and Non Renewable Resources Difference Between Unicellular And Multicellular Organisms Difference Between Vertebrates and Invertebrates Difference between Voluntary and Involuntary Muscles Difference Between Xylem and Phloem Different Types Ecological Pyramids Diffusion - Means of Transport Disadvantages of Dams Ecology Endemic Species Endocrine System Ductless Glands Energy Flow In Ecosystem Excretion and Its Importance Food ProductionFood Web
Fragmentation
Gemmules
GibberellinsGrassland Adaptations
GuttationGymnosperms
Harmful Microorganisms
Homeostasis
Human Body Anatomy
Human HeartInvertebrates
Kingdom Monera Protista Fungi Law of Segregation and Law of DominanceLife process
Light-dependent Reactions
Lipids
Living Things
Macromolecule Meiosis 1 Stages and Process Mendelian Disorders Microbodies Modern Synthetic Theory of Evolution Monera Nephron Function Renal Tubules Nuclear Membrane Nucleolus Nucleus Our Environment Parasitism Parts of Plants Passive Transport Plant Cell Plant Kingdom Plantae Plant Respiration Plants Plastids Protista Red Data Book Reproductive System of Earthworm Ribosomes Scientific Names of Animals and Plants Seed germination Sensory Perception Snail Skeletal System Spermatogenesis Structure Of Eye Taxonomic Hierarchy Taxonomy Algae ThallophyteTypes of Soil
Vacuoles What Is Adaptation Agricultural Practices Animal Kingdom Alimentary Canal Coelenterata Conservation of Forest and Wildlife Difference between Endosmosis and Exosmosis Difference between Afforestation and Deforestation Difference between Algae and Fungi Difference between Cereals and Pulses Difference Between Fragmentation and Regeneration Difference Between Neurosis and Psychosis Difference Between Nucleotide and NucleosideDifference Between Sea and Ocean
Difference Between Turtles and Tortoises
Difference Between Wildlife Sanctuary and National Park
Modes of Plant Reproduction
Ecological Pyramid and Its Types
Double Fertilization in Angiosperms
Ecosystem EnzymesFertilisation in Plants
Five Kingdoms Classification
FlowerGanongs Potometer
Health and Hygiene
Herbivores and Carnivores
Heterotrophic Nutrition Human Digestive SystemVertebrates and Invertebrates
Morphology of Leaves
Modifications of Root
Phylum AschelminthesDiffusion
Osmosis
Prokaryotic Cells
Reproduction
Flora And Fauna
Overview of Food ChainDifference Between Rabi And Kharif Crops
Vegetative Propagation Angiosperms Characteristics Soil ProfileTypes of Pollution
Human Excretory System Sense Organs Rainwater HarvestingProkaryotic And Eukaryotic Cells
Living And Non Living Things
The Nucleus
Irrigation
Endoplasmic Reticulum
Between Data And Information
Mitochondria
Nitrogen Cycle
Diagram of Animal Cell
Meristematic TissueLaw of Segregation Law of Dominance
Eukaryotic CellsSources Animal Plant Products
Photosynthesis Respiration Ozone Layer Depletion Kingdom Fungi Aerobic Anaerobic Respiration Cell Organelles Peristalsis Bacteria OogenesisLeaves Morphology Types Modification
Mitosis and Meiosis
Dna StructureHow Do Organisms Reproduce
Diagram of Stomata
Monohybrid Cross Inheritance One Gene Mechanism of BreathingSoil Erosion
Plasmolysis
Urine Formation Osmoregulation
Porifera
Flagella
Amoeba
Aerobic Respiration
Pteridophyta
Arteries And Veins Difference
Reflex Action
Stomata
Cell Wall
Diagram of Neuron
A Guide To Composition And Function Of Lymph
Difference Between Ligaments And Tendons
Insectivorous Plants
Nutrition Modes Living Organisms
Mendel Laws Of Inheritance
Nutrition In Amoeba
Calorific Value
Air Pollution Control
Fertilization In Plants
Life ProcessesBinary Fission
Omnivores
Saprophytes
Asexual Reproduction
Deficiency Diseases
Light Reaction Vs Dark Reaction
Global Warming
Wildlife Sanctuary
Viviparous Oviparous Embryo Development
GlycolysisFood Preservation Methods Food Poisoning
Crops
Biofertilizers
Biodiversity Conservation
Difference Between Endocrine And Exocrine Glands
Greenhouse Effect GasesDiagram Of Digestive System
Crop Production And Management
Types Of Pollination
Introduction and Characteristics of Living Beings Meristematic Cells Taxonomical Aids _Flora, Manual, Monograph And Catalogues Types of leaves structure of skeletal muscle spirometry human respiratory system herbarium dinoflagellates general characters and structure of leaf halophiles and their features Exchange of Gases Simple Permanent tissue Morphology of root and its types Complex permanent tissues Regions of Root History of classification and its need Breathing And Exchange Of Gases Transport of Gases Regulation of Respiration Disorders of Respiratory System Interaction of Haemoglobin with Other Gases Amniocentesis Anatomy of flowering plants ASSISTED REPRODUCTIVE TECHNOLOGIES (ARTs) Meristematic Cells Phloems Population explosion Reproductive Health RCH (Reproductive and Child Health Care) Medical termination of Pregnancy (MTP) Plant kingdom Biological Systems of Classification & Branches of Taxonomy Pteridophytes Gymnosperms Angiosperms Life cycle Patterns Anatomy of Roots Contraceptives Anatomy of stem Algae Bryophytes Tissues and its types STDs (Sexually Transmitted Diseases) Cell - The Basic Unit of Life & its Historical background Cell theory and its modification An Overview of Cell Secondary growth in dicot stem Tissue system and types Prokaryotic (Bacterial) cell Ribosomes Eukaryotic cell Cell: The basic unit of life Cytoskeleton Centrosome and Centriole Cilia and flagella Nucleus Chromosomes Evolution Movement and Locomotion Human Reproduction Absorption and Translocation of Solutes Soil as a reservoir of Essential Elements LOCOMOTION AND MOVEMENT Mechanism of Muscle Contraction Morphology in Flowering Plants Contractile proteins Muscular System Thyroid Puberty Hormones Origin of Universe Hypothalamus Cell wall Mitochondria Special Chromosomes Microbodies Introduction, Hydroponics and the study of mineral requirements of the plants Criteria of essentiality and Categorisation of Essential elements Deficiency symptoms of essential elements and toxicity The Stem The Root Cytoplasm and cell membrane Mineral Nutrition Disorders Related To Reproductive System Phylum Ctenophora Role of Macronutrients Role of Micronutrients Phylum - Coelenterata / Cnidaria Reptilia Aves Mammalia Anatomy of the leaf Animal kingdom Phylum Annelida Phylum Mollusca Phylum Echinodermata Vertebrata Chordates Disorders of circulatory system Abiotic Factors Male Reproductive System Kingdom Animalia Responses to Abiotic Factors Female Reproductive System Mammary Glands Pregnancy and Embryonic Development Cell Cancer Disorders of the Digestive System Infertility Morphology of Cockroach Blood and Plasma Alternation of Generations and Classification Predation Phaeophyceae and Rhodophyceae Phylum Coelenterata Phylum Porifera Phylum Platyhelminthes Chromosomal Disorders Competition Taxonomic Aids Alternation of generation in Pteridophytes Disorders of muscular and skeletal system General Characteristics of Living Digestive Glands Stomach Testis Buccal cavity Seed Common Diseases in Humans Permanent Tissue Permanent Tissues Xylem Pteridophytes Characteristics Parasitism and Commensalism Water Pollution and Its Control Differentiation, Dedifferentiation and Redifferentiation Organism and its Environment Carbohydrates Greenhouse Effect Gases Amino Acids Dynamic State of Body Constituents Photosynthesis Chloroplast Features of Living Beings Blood Group Lipids Kingdom Protista dense connective tissue connective tissue cartilage connective tissue blood plant cell viruses the stem Connective Tissue Bone Viroids Prions Lichens Animal cell Prokaryotic Cell Taxonomic Aids Herbarium and Museum Sphygmomanometer and ECG Population Attributes Noise pollution Diaphragm Parts of a Plant Photoperiodism Poultry Farming Nucleic Acids Cell Cycle Principles of Biotechnology Antibiotics IVF Glands Kranz Anatomy Sexual Reproduction in Plants Cytokinin Plant Development Biofertilizers Photorespiration Auxin Nutrient Cycling Types of Flowers Taxonomic Hierarchy and Categories Epidermal Tissue System Calyx and Corolla Ethylene Fertilization and Implantation Types of Fruits Inflorescence Types of Growth Macronutrients Family Liliaceae ETC and Oxidative Phosphorylation Classification of Wood Ground Tissue System Secondary Growth in Stem Plant Vascular System Electron Transport System Transpiration Difference Between Types of Cells Ovary Structure Birth Control Epithelial Tissue Endomembrane System Cell Envelopes and Cell Membrane Muscle Types Axial Skeleton Acquired Immunity Lung Volumes and Capacities Suspension and Migration Prokaryotic Cells
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