Acid Base

Que 1

What are acid base indicators?


Ans

Acid base indicators are mixture of dyes which are used to indicate the presence of acids and bases


Que 2

What are properties of acid


Ans

Acids are sour in taste

Acid change the colour of blue litmus to red

Whenever acids are dissolved in water they give H+ ion


Que 3
What are properties of a base

Ans
Bases are bitter in taste
Bases change the colour of litmus to blue
When bases dissolve in water they give hydroxyl ions (OH)-


Que 4
Name some natural indicators

Ans
Litmus and turmeric

Que 5
Name some synthetic indicators

Ans
Methyl orange and phenolphthalein

Que 6
What is litmus solution

Ans
Litmus solution is a purple dye which is extracted from the lesson it is commonly used as an indicator litmus solution is neither acidic or basic its colour is purple

Que 7
Name some acid base indicators

Ans
Hydrangea ,petunia, Geranium

Que 8
If we have three test tubes one of them contains distilled water other two contains acidic solution and basic solution and if we have a litmus paper how will be identify the contents

Ans
we draw all the solutions and all test tubes one by one on the litmus paper

The solution which has no effect on litmus paper shows that this test tube contain distilled water

The solution which turns red litmus paper to blue colour it shows that the solution is basic solution

And the solution in the test tube which turns litmus paper blue colour to red it shows that the solution is acidic solution

Que 9
What is indicator

Ans
Indicator tell us whether a substance is acidic or basic by changing its colour

Que 10
What are olfactory indicators

Ans
There are substances whose odour changes in acidic and basic media these are known as olfactory indicators for example Vanilla onion

Que 11
What is neutralisation reaction

Ans
Acid and base react with each other to form salt and water is known as neutralization reaction

Acid +Base= Salt+ Water

Que 12
What are alkali

Ans
Bases which are soluble in water are called alkali they are so be to touch bitter and corrosive

Que 13
What is universal indicator

Ans
Universal indicator is a mixture of several indicators it shows different colours at different concentrations of hydrogen ions in a solution

Que 14
What is pH scale

Ans
Scale for measuring hydrogen ion concentration in solution is called pH scale

on pH scale we can measure pH generally from 0 to 14
pH of a neutral solution is 7
PH less than 7 represents acidic solution
as the value of PH increases from 7 to 14 it represents increase in hydroxyl ion concentration in the solution presents basic solution

Que 15
What is brine solution

Ans
Aqueous solution of sodium chloride is called a brine solution

Que 16
Name the compound

a) used in soda acid fire extinguisher

Ans
Baking soda

b ) used to make drinking water free from germs

Ans
Bleaching powder

c) used to remove permanent hardness of water

Ans
Washing soda

d) used by doctors in treatment of fractured bones

Ans
Plaster of Paris

Que 17
What is the water of crystallization

Ans
What is the fixed number of water molecules present in one formula unit of a salt

Que 18
Name the acid which presence in the stomach of the human being

Ans
Hydrochloric acid

Que 19
PH value of element A is 5 and element Bis 12 which of them is acid and which of them is base

Ans
The elements which have PH value less than 7 are acidic in nature
The elements which have PH value greater than 7 and less than 14 are basic in nature

So element A is acid where as element B is base

Que 20
In order to make dilute acid why we not add water in acid

Ans
Acid are corrosive in nature so there must be a blast if we add water in acid so in order to make dilute acid we add acid in water drop voice drop

Sat Dec 3, 2022

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Sonika Agarwal
A California-based travel writer, lover of food, oceans, and nature.

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