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Repost from 🅱EASTSOURCE 📔
PROPERTIES OF ACIDS AND BASES.
Each substance shows some typical or characteristics properties. We can categorize a substance as an acid or a base according to the properties displayed. Let us learn the characteristic properties of acids and bases.
Properties of Acids
1. Taste
You must have noticed that some of the food items we eat have sour taste. The sour taste of many unripe fruits, lemon, vinegar and sour milk is caused by the acids present in them. Hence, we can say that acids have a sour taste. This is particularly true of dilute acids.
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Repost from 🅱EASTSOURCE 📔
Some examples of bases are:
(i) Sodium hydroxide (NaOH) or caustic soda used in washing soaps.
(ii) Potassium hydroxide (KOH) or potash used in bathing soaps.
(iii) Calcium hydroxide (Ca(OH)2) or lime water used in white wash.
(iv) Magnesium hydroxide (Mg(OH)2) or milk of magnesia used to control acidity.
(v) Ammonium hydroxide (NH4OH) used in hair dyes.
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BASES
A base is a substance which furnishes hydroxide ions (OH–) when dissolved in water.
For example, sodium hydroxide NaOH (aq), in its aqueous solutions, dissociates as:
NaOH (aq) ⎯⎯→ Na+(aq) + OH–(aq)
The term ‘alkali’ is often used for water soluble bases.
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Repost from 🅱EASTSOURCE 📔
Some examples of acids are:
(i) Hydrochloric acid (HCl) in gastric juice
(ii) Carbonic acid (H2CO3) in soft drinks
(iii) Ascorbic acid (vitamin C) in lemon and many fruits
(iv) Citric acid in oranges and lemons
(v) Acetic acid in vinegar
(vi) Tannic acid in tea
(vii) Nitric acid (HNO3) used in laboratories
(viii) Sulphuric acid (H2SO4) used in laboratories
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Repost from 🅱EASTSOURCE 📔
While Robert Boyle was successful in characterising acids and bases he could not explain their behaviour on the basis of their chemical structure. This was accomplished by Swedish scientist Svante Arrhenius in the late nineteenth century. He proposed that on dissolving in water, many compounds dissociate and form ions and their properties are mainly the properties of the ions they form. Governed by this, he identified the ions furnished by acids and bases responsible for their characteristic behaviour and gave their definitions.
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ACIDS AND BASES
Introduction:
For thousands of years, people have known that vinegar, lemon juice, Amla, tamarind and many other food items taste sour. However, only a few hundred years ago it was proposed that these things taste sour because they contain ‘acids’. The term acid comes from Latin term ‘accre’ which means sour. It was first used in the seventeenth century by Robert Boyle to label substances as acids and bases according to the following characteristics: ✍🏻👇
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Today we will Commence our studies with INTEGRATED SCIENCE [ACID, BASE and SALT] ❤️so get your Pens 🖊 and Jotters ready ⏱
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The West Africa Examination Council (waec) has announced the official date for the commencement of the wassce 2023 waec examination.
The West Africa Examination Council (waec) has stated the main WASSCE,SSCE examination for school Candidates to start on Monday, 31st July to Tuesday, 26th September, 2023. The final timetable for the examination will be made available to all schools in due time. Ghana will write alone. BECE date has finally been settled on the 7th to 11th of August 2023.
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Today we will Commence our studies with INTEGRATED SCIENCE
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