Chemistry One-Liners for various competitive examinations

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Chemistry One-Liners for various competitive examinations

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 Here are some important Chemistry one-liners for students competing for various exams

 Watch some of the important Chemistry Bits below.


pH SCALE

1- The scale that measures the strength of an acid or a base is called the pH scale. This value of pH scale lies between 0 and 14 with 7 as the middle (neutral) point.

* A neutral solution will have no effect on any litmus solution or any other indicator.

* The pH is the negative logarithm of the concentration of hydrogen ions in the solution.

* The pH value of any solution is numerically equal to the logarithm of the inverse of the hydrogen ion (H+) concentration. Hence, the pH of a solution is referred to as the negative logarithm of hydrogen ion.

* Acid Rain– When pH of rainwater is less than 5.6, it is called acid rain.

* Lemon Juice – 2.2

* Gastric juice – 1.2

* Milk of magnesia – 10

* Pure water – 7.4

* Sodium hydroxide solution – 14

* At a PH of 7-7.8, most food crops grow best.

* The pH of the soil can be raised by adding lime (or slaked lime) if the soil is too acidic. It neutralizes the excess acid in the soil.

* If the soil is too alkaline then its pH can be lowered by adding either gypsum or some other substance that can neutralize the excess alkali present in the soil.

* The pH of a neutral solution is 7.

* If the values less than 7 on the pH scale, it represents an acidic solution. It will turn blue litmus into the red as well as methyl orange pink and phenolphthalein colorless.

* As the pH value increases from 7 to 14, it represents an increase in OH– ion concentration in the solution. It will increase in the strength of alkali.

* Whenever a solution has more than 7 values then it will be basic in nature and it will turn red litmus to blue, methyl orange to yellow and phenolphthalein to pink.

* The medium in our stomach is highly acidic and has pH around 1.2.

* pH stands for ‘potential of Hydrogen’. It measures the acidity or alkalinity of water-soluble substances. It is measured with a logarithmic scale known as pH

* To calculate the pH of an aqueous solution one should need to know the concentration of the hydronium ion in moles per liter (molarity).

* A Danish biochemist S.P.L Sorenson in 1909 devised a scale pH to represents the H+ ion concentration of an aqueous solution.

2- A Buffer Solution or a buffer is defined as a solution whose pH does not change when a small amount of an acid or base is added in it.

* The solution of Sodium Acetate and Acetic acid is an example of an effective buffer solution.


 

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