Acids Bases And Salts Class 7 Notes Pdf Download LINK

Strength of Acid and Base: Acids in which complete dissociation of hydrogen ion takes place are called Strong Acids. Similarly, bases in which complete dissociation of hydroxide ion takes place are called Strong Bases.

In mineral acid, such as hydrochloric acid, sulphuric acid, nitric acid, etc. hydrogen ion dissociates completely and hence, they are considered as strong acids. Since inorganic acids hydrogen ions do not dissociate completely, so they are weak acids.

For water or neutral solutions : pH = 7

For acidic solutions : pH < 7

For basic solution : pH > 7

Many acids and bases occur naturally in nature, such as citric acid in fruits like orange, lemon, etc, tartaric acid in tamarind, malic acid in apples, and lactic acid in milk and milk products, hydrochloric acid in gastric juices.

Acids Bases And Salts Class 7 Notes Pdf Download

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Similarly, many bases are found such as lime water. We use many of these acids in our day-to-day life, such as vinegar or acetic acid in the kitchen, boric acid for laundry, baking soda for the purpose of cooking, washing soda for cleaning, etc.

In chemistry, a salt is a substance obtained by the reaction of an acid and a base. Salts are composed of positive ions (cations) of bases and negative ions (anions) of acids. The reaction of acid and base is called the neutralization reaction.

Litmus, red cabbage leaves, turmeric (haldi) coloured petals of some flowers such as hydrangea, petunia and geranium etc. are natural acid-base indicators. Methyl orange, phenolphthalein etc. are synthetic indicators. Universal indicator is a mixture of several indicators. It shows different colours at different concentrations of hydrogen ions. We can estimate the strength of acids and bases by using universal indicators.

Join Chef Ragu as he learns about acids, bases, and salts while he cooks up something special. In this interactive tutorial you will compare and classify the properties of compounds that are acids, bases, and salts and identify basic examples of these compounds.

This topic is included in Paper 1, Paper 2, Paper 3, Paper 4, Paper 5 and Paper 6 for IGCSE CAIE Chemistry.

Notes:DefinitionsFlashcardsSummary Notes8.1. The characteristic properties of acids and bases8.2. Types of oxides8.3. Preparation of salts8.4. Identification of ions and gasesgoogletag.cmd.push(function() { googletag.display('PMT_Mobile'); }); e24fc04721