GROUP D PH VALUE Hindi list TOP 20 ASKED IN Railway NTPC GROUP D // SSC CGL CHSL CPO MTS CPO

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Chemistry Notes on Acids and Base for Railways & SSC Exam

Some important acids and their presence

These acids are mostly asked in SSC Exams. Don't forget to remember this table.

Acid

Present in

Acetic Acid

Vinegar

Formic Acid

Red ants

Citric Acid

Citrus Fruits

Lactic Acid

Curd

Ascorbic Acid

Amla

Tartaric Acid

Grapes, Ripe Mangoes

Oxalic Acid

Spinach

PH Scale

PH value is a measure of the acidity or basicity of an aqueous solution.

Solution with PH value less than 7 is considered as acidic.

Solution with PH value greater than 7 is greater 7 is considered as basic.

PH values of some important solutions.

Substance

PH Value

Blood

7.3 to 7.5

Tears

7.4

Saliva

6.5-7-5

Urine

5.5-7.5

Coffee

4.5-5.5

Beer

4.0-5.0

Wine

2.8-3.8

Vinegar

2.4 -3.4

Buffer Solutions:

The solutions which resist the change in its PH value on an addition of a small amount of acid or base are called buffer solutions.

Acidic buffer solution has PH value less than 7.

Basic buffer has PH value greater than 7.

PH value of blood is maintained with the help of H2CO3/HCO3 buffer in spite of many acidic foods we eat.

Salts:

When acidic and basic solutions are mixed in proper proportion than their own nature is destroyed and Salt is formed.

Acid turns blue litmus red and base turns red litmus blue.

Formation of salts after mixing base and acidic is called a neutralisation reaction.





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What does pH value mean?

Substance


pH Values


Pure water


7


Human blood


7.35 – 7.45


Sea water


7.5 – 8.4



Ammonia


10.6 to 11.6


Milk


6.5 – 6.7


Normal rain


5.6 to 6


Acid rain


2 to 5.6


Human urine


6


Black coffee


5


Beers


4.5


Wines


2.8 to 3.8


Vinegar


2.9


Lemon juice


2.4



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