Topics
Chemical Reactions and Equations
- Chemical Equation
- Balancing Chemical Equation
- Types of Chemical Change or Chemical Reaction
- Direct Combination (or Synthesis) Reaction
- Decomposition Reactions
- Single Displacement Reactions
- Double Displacement Reaction
- Oxidation, Reduction and Redox Reactions
- Corrosion of Metals and Its Prevention
- Rancidity of Food and Its Prevention
Chemical Substances - Nature and Behaviour (Chemistry)
Acids, Bases and Salts
- Acids
- Bases (Alkalis)
- Indicators
- Properties of Acids
- Properties of Bases (Alkalis)
- Acid or a Base in a Water Solution
- Similarities and Differences Between Acids and Bases
- Strength of Acidic or Basic Solutions
- Salts
- Important Salts in Daily Life
- Preparation and Uses of Sodium Hydroxide
- Preparation and Uses of Bleaching Powder
- Preparation and Uses of Baking Soda
- Preparation and Uses of Washing Soda
- Preparation and Uses of Plaster of Paris
World of Living (Biology)
Metals and Non Metals
- Types of Elements: Metals
- Physical Properties of Metals
- Chemical Properties of Metal
- Types of Elements: Non-metal
- Physical Properties of Non-metal
- Chemical Properties of Non-metal
- Electrovalent (or Ionic) Bond
- Reactivity Series of Metals
- Extraction of Metals
- Refining of Metals
- Corrosion of Metals and Its Prevention
- The Covalent Bond
Natural Phenomena (Physics)
Carbon and its Compounds
- Carbon: a Versatile Element
- The Covalent Bond
- Saturated and Unsaturated Carbon Compounds
- Allotropy and Allotropes of Carbon
- Crystalline Allotropes of Carbon: Diamond
- Crystalline Allotropes of Carbon: Graphite
- Crystalline Allotropes of Carbon: Fullerene
- Chains, Branches and Rings of Carbon Compound
- Functional Groups in Carbon Compounds
- Homologous Series of Carbon Compound
- Nomenclature of Organic Compounds (IUPAC)
- Chemical Properties of Carbon Compound
- Ethanol
- Ethanoic Acid
- Soap
- Detergents
- Cleansing Action of Soap
Effects of Current (Physics)
Natural Resources
Periodic Classification of Elements
- History of Periodic Table: Early Attempts at the Classification of Elements
- Dobereiner’s Triads
- Newland's Law of Octaves
- Mendeleev’s Periodic Table
- Merits and Demerits of Mendeleev’s Periodic Table
- The Modern Periodic Table
- Periodic Properties
- Periodic Properties: Valency
- Periodic Properties: Atomic Radius Or Atomic Size
- Periodic Properties: Metallic Character
- Periodic Properties: Non-metallic Character
Life Processes
- Living Organisms and Life Processes
- Nutrients and Nutrition
- Mode of Nutrition in Plant
- Autotrophic Nutrition
- Heterotrophic Nutrition
- Different Ways of Taking Food
- Human Digestive System
- The Mouth and Buccal Cavity
- The Teeth and Its Structure
- The Salivary Glands
- Swallowing and Peristalsis
- The Food Pipe/Oesophagus
- The Stomach
- The Small Intestine
- Pancreas
- Absorption of Food
- The Large Intestine
- Assimilation of Food
- Liver
- Respiration
- Respiration in Organisms
- Breathing in Other Animals
- Osmoregulation
- Types of Respiration: Aerobic and Anaerobic Respiration
- Human Respiratory System
- Circulation
- Blood
- Composition of Blood: Plasma (The Liquid Portion of Blood)
- Composition of Blood: Red Blood Cells (Erythrocytes)
- Composition of Blood: White Blood Cells (Leukocytes)
- Composition of Blood: Blood Platelets (Thrombocytes)
- Blood Circulatory System in Human
- Human Heart
- Blood Vessels – Arteries, Veins, and Capillaries
- Circulation of Blood in the Heart (Functioning of Heart)
- Types of Blood Circulation
- Heart Beat - Heart Sounds "LUBB" and "DUP"
- Function of Platelets - Clotting of Blood (Coagulation)
- Lymph and Lymphatic System
- Blood Pressure (B.P.)
- Transportation of Water and Food in Plants
- Water and Mineral Absorption by Root
- Translocation of Water (Ascent of Sap)
- Translocation of Mineral Ions
- Transport of Food
- Transpiration
- Excretion: Substances to Be Eliminated
- Human Excretory System
- Function of the Kidney - “Production of Urine”
- Excretion in Plants
Internal assessment
Control and Co-ordination
- Control and Co-ordination in Animals
- Human Nervous System
- Neuron (Or Nerve Cell) and Its Types
- Neuron as Structural and Functional Unit of Neural System
- Nerve Fibres
- Major Division of the Nervous System
- Central Nervous System (CNS)
- Peripheral Nervous System (PNS)
- The Human Brain
- Central Nervous System (CNS): Structure of Human Brain
- Reflex and Reflex Action
- Nervous Pathways in Reflexes
- Reflex Arc
- Co-ordination in Plant: Tropism in Plants
- Hormones
- Plant Hormones
- Types of Plant Hormones: Auxins
- Types of Plant Hormones: Gibberellins
- Types of Plant Hormones: Ethylene
- Types of Plant Hormones: Cytokinins
- Types of Plant Hormones: Abscisic Acid (ABA)
- Types of Plant Hormones: Ethylene
- Hormones in Animals
- Human Endocrine System
- Pituitary Gland or Hypophysis Gland
- Thyroid Gland
- Parathyroid Gland
- Pancreas (Islets of Langerhans)
- Adrenal Gland (Suprarenal Gland)
- Reproductive Glands (Gonads)
- Thymus Gland
How do Organisms Reproduce?
- Accumulation of Variation During Reproduction
- Reproduction in Plant
- Mode of Reproduction in Plant
- Asexual Reproduction in Plant
- Natural Vegetative Reproduction
- Sexual Reproduction in Flowering Plants
- Sexual Reproduction in Animals
- Human Reproductive System
- The Male Reproductive System
- The Female Reproductive System
- Menstrual Cycle (Ovarian Cycle)
- Reproductive Health
- Sexually Transmitted Diseases (STD)
Heredity and Evolution
- Accumulation of Variation During Reproduction
- Heredity
- Gregor Johann Mendel – Father of Genetics
- Inheritance of One Gene (Monohybrid Cross)
- Inheritance of Two Genes (Dihybrid Cross)
- Mendelian Inheritance - Mendel’s Laws of Heredity
- Sex Determination
- Evolution
- Lamarck’s Theory of Evolution
- Darwin’s Theory of Natural Selection
- Theories of Origin of Life
- Speciation
- Evolution and Classiffication
- Evidences for Biological Evolution
- Paleobotany
- Evolution by Stages
- Origin and Evolution of Man
Light - Reflection and Refraction
- Reflection of Light
- Law of Reflection of Light
- Mirrors and Its Types
- Plane Mirror and Reflection
- Spherical Mirrors
- Rules for the Construction of Image Formed by a Spherical Mirror
- Images Formed by Spherical Mirrors
- Concave Mirror
- Image Formation by Concave Mirror
- Convex Mirror
- Image Formation by Convex Mirror
- Sign Convention for Reflection by Spherical Mirrors
- Mirror Equation/Formula
- Linear Magnification (M) Due to Spherical Mirrors
- Refraction of Light
- Refraction of Light Through a Rectangular Glass Slab
- Law of Refraction of Light
- Refractive Index
- Spherical Lens
- Images Formed by Sperical Lenses
- Guideline for Image Formation Due to Refraction Through a Convex and Concave Lens
- Concave Lens
- Images Formed Due to Refraction Through a Concave Lens
- Convex Lens
- Images Formed Due to Refraction Through a Convex Lens
- Sign Convention for Spherical Lenses
- Lens Formula
- Magnification Due to Spherical Lenses
- Power of a Lens
The Human Eye and the Colourful World
- Human Eye: Structure of the Eye
- Working of the Human Eye
- Eye Defect and Its Correction: Myopia Or Near-sightedness
- Eye Defect and its correction: Hypermetropia or far-sightedness
- Eye Defect and Its Correction: Presbyopia
- Care of the Eyes
- Refraction of Light Through a Prism
- Concept of Prism
- Dispersion of Light Through Prism and Formation of Spectrum
- Atmospheric Refraction
- Application of Atmospheric Refraction
- Scattering of Light and Its Types
- Applications of Scattering of Light
Electricity
- Electricity
- Electric Current
- Electric Circuit
- Potential and Potential Difference
- Symbols and Functions of Various Components of an Electric Circuits
- Ohm's Law
- Factors Affecting the Resistance of a Conductor
- Electrical Resistivity and Electrical Conductivity
- Resistors in Series
- Resistances in Parallel
- Effects of Electric Current
- Heating Effect of Electric Current
- Electrical Power
Magnetic Effects of Electric Current
- Magnetic Effect of Electric Current
- Magnetic Field
- Magnetic Field Lines
- Magnetic Field Due to a Current Carrying Straight Conductor
- Rule to Find the Direction of Magnetic Field
- Magnetic Field Due to Current in a Loop (Or Circular Coil)
- Magnetic Field Due to a Current Carving Cylindrical Coil (or Solenoid)
- Force on a Current Carrying Conductor in a Magnetic Field
- Electric Motor
- Electromagnetic Induction
- Faraday's Laws of Electromagnetic Induction
- Electric Generator
- Alternating Current (A.C.) Generator
- Direct Current Motor
- Household Electrical Circuits
- Distinction Between an A.C. Generator and D.C. Motor
- Types of current: Alternating Current (A.C.) and Direct Current (D.C.)
Sources of Energy
- Source of Energy
- Conventional Sources of Energy and Non-conventional Sources of Energy
- Fossil Fuels
- Heat Energy (Thermal Energy)
- Hydroelectric Energy
- Bio-energy
- Wind Energy
- Solar Energy
- Solar Energy Devices
- Energy from the Sea
- Geothermal Energy
- Nuclear Energy
- Nuclear Fission
- Different Forms of Energy
- Environmental Consequences
- How Long Will an Energy Source Last Us?
Our Environment
Sustainable Management of Natural Resources
- Sustainability of Natural Resources
- Case Study: Ganga Pollution and Ganga Action Plan
- Solid Waste Management
- Five R’s of Waste Management
- Conservation and Judicious Use of Resources
- Forests: Our Lifeline
- Stakeholders of Forest
- Conservation of Forest
- Conservation of Wildlife
- Water Management (Conservation of Water)
- Fresh Water Management
- Non-crystalline/Amorphous Forms: Coal
- Petroleum
- Conservation of Coal, Petroleum, and Natural Resources
- Overview of Natural Resource Management
notes
INDICATORS:-
Natural indicator:-
Natural Indicator is a type of indicator that can be found naturally and can determine whether the substance is acidic or basic in nature.
Examples:-
- Litmus
- Turmeric
- Red Cabbage Juice
- Onion
- Vanilla
Synthetic indicators:-
Synthetic indicator is a man made chemical substance that is used to determine the pH of another substance.
Examples:-
- Methyl orange
- Phenolphthalein
Universal Indicators:-
A universal indicator is a pH Indicator made of a solution of several compounds that exhibits several smooth colour changes over a wide range pH values to indicate the acidity or alkalinity of solutions.
Indicator |
Original colour |
Acid |
Base |
Red litmus |
Red |
No change |
Blue |
Blue litmus |
Blue |
Red |
No change |
Turmeric |
Yellow |
No change |
Reddish brown |
Red cabbage juice |
Purple |
Reddish |
Greenish yellow |
Phenolphthalein |
Colourless |
Colourless |
Pink |
Methyl orange |
Orange |
Red |
Yellow |
Onion |
n/a |
No change |
Smell vanishes |
Vanilla |
n/a |
No change |
Smell vanishes |
CONCEPT OF pH SCALE:-
In pH scale ‘p’ stands for ‘potenz’. Potenz is a German word which means ‘power’ or ‘potential’. Here; ‘H’ stands for hydrogen ion. Thus, pH means the potential of hydrogen or power of hydrogen.
The strength of acid or base depends upon the hydrogen ion concentration. If the concentration of hydrogen ion is greater than hydroxide ion, the solution is called acidic. If the concentration of hydrogen ion is smaller than the hydroxide ion, the solution is called basic. If the concentration of hydrogen ion is equal to the concentration of hydroxide ion, the solution is called neutral solution.
pH is a measure of hydrogen ion concentration a measure of the acidity or alkalinity of a solution.
The pH scale usually ranges from 0 to 14. Aqueous solution at 25°C with a pH less than 7 are acidic while those with a pH greater than 7 are basic or alkaline. A pH level of 7.0 at 25°C is defined as ‘Neutral’.
REACTION OF ACID & BASES WITH METALS:-
When an acid reacts with a metal, hydrogen gas is evolved and a corresponding salt is formed.
Given below is the reaction of Zinc Granules with Dilute sulphuric acid
-
Set the apparatus as shown in Fig
-
Take about 5 mL of dilute sulphuric acid in a test tube and add a few pieces of zinc granules to it.
-
What do you observe on the surface of zinc granules?
-
Pass the gas being evolved through the soap solution.
-
Why are bubbles formed in the soap solution?
-
Take a burning candle near a gas filled bubble.
Observation:-
-
Bubble formation takes place inside the test tube
-
The gas passes through the delivery tube into the soap solution resulting in formation of soap bubbles
-
when a burning candle is taken near the gas filled bubble we hear a pop sound, this is because the soap bubbles are filled with hydrogen gas.
Acid + Metal → Salt + Hydrogen gas
2NaOH(aq) + Zn(s) → Na2ZnO2(s) + H2(g)
Examples:-
When Magnesium reacts with Hydrochloric acid it forms Magnesium Chloride and liberates Hydrogen gas.
Mg + 2HCl → MgCl2+ H2
When a base reacts with a metal, hydrogen gas is evolved and salt is formed which has a negative ion composed of the metal and oxygen.
Examples:-
When Aluminium reacts with Sodium hydroxide it forms Aluminium Hydroxide and liberates Hydrogen gas.
2Al + 2NaOH + 6H2O → 2Na+ +2[Al(OH)4]- + 3H2
REACTION OF ACID WITH METAL CARBONATE AND METAL HYDROGEN CARBONATES:-
- Take two test tubes, label them as A and B.
- Take about 0.5 g of sodium carbonate (Na2CO3) in test tube A and about 0.5 g of sodium hydrogencarbonate (NaHCO3) in test tube B.
- Add about 2 mL of dilute HCl to both the test tubes
- Pass the gas produced in each case through lime water (calcium hydroxide solution)
OBSERVATION:-
- When HCL is added to sodium carbonate carbon dioxide gas is liberated.
- When this gas is passed through lime water a white precipitate of calcium carbonate is formed
- When we pass carbon dioxide gas through lime water then calcium carbonate is formed.
Ca(OH)2(s)+CO2(g)→CaCO3(s)+H2O(l)
On passing the excess carbon dioxide we get the calcium bicarbonate
CaCO3(s) + H2O(l) + CO2(g) → Ca(HCO3)2(aq)
When an acid react with a metal carbonate or metal hydrogencarbonate, it gives salt, carbon dioxide gas and water.
Metal carbonate/Metal hydrogencarbonate + Acid → Salt + Carbon dioxide + Water
Example:-
Calcium carbonate + Sulfuric acid Calcium sulfate + Water + Carbon Dioxide
CaCO3+ H2SO4 → CaSO4+ H2O + CO2
REACTION OF ACIDS WITH METAL OXIDES:-
Metal oxide + Acid → Salt + Water
Metal oxides react with acid to form salt and water.
2HCl+ Na2O → 2NaCl + H2O
Hydrochloric acid reacts with sodium oxide to form sodium chloride (salt) and H2O
REACTION OF BASE WITH NON METAL OXIDES:-
Non metallic oxides are acidic in nature therefore react with base to form salt and water.
Non-metallic Oxide + Base → Salt + Water
Ca(OH)2(aq) + CO2(g) → CaCO3(s) + H2O(l)
Calcium hydroxide when reacts with carbon dioxide produces calcium carbonate and water.
REACTION OF ACID AND BASES:-
Acid when react with a base produces salt and water
Acid + Base Salt + Water
HCl + NaOH → NaCl + H2O
When an acid or a base is dissolved in water, they get dissociated into ions.
For example,
- When hydrochloric acid is dissolved in water, it get dissociated into ions such as protons (H+ions) and Cl-ions as follows:
- HCl + H2O → H3O++ Cl-
- As there is an increase in the protons in the aqueous solutions, the solution is acidic in nature.
- Similarly, when NaOH is dissolved in water, it get dissociated as,
- NaOH + H2O → Na++ OH-+ H2O
- As there is an increase in the hydroxyl ions in the solution, the solution is basic in nature.
- Basic aqueous solution is called alkali.
description
- Properties of Acids
- Physical properties of Acids
- Taste
- Physical state
- Effect on skin
- Colours of indicators
- Chemical properties of Acids
- Reaction with active metals
- Reaction with bases - Neutralisation
- Decomposition of hydrogen carbonates and carbonates
- Decomposition of sulphites and bisulphites
- Decomposition of sulphides
- Reaction with chlorides and nitrates
- Reaction with metal oxide
Video Tutorials
Shaalaa.com | pH scale
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