GK in pdf

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pH value of some important substances

List of pH value of some important substances in pdf . for competitive job exam like ssc, psc, wbcs, railway, esic, lic, bank and other competitive exam.

The Invention of pH Scale

All acids produce H+ ions when dissolved in water, but it's how much H+ a specific acid can produce in water that will determine whether it is able to safely eaten or not. But how do we formulate and measure H+ concentration. Søren Peder Lauritz Sørensen, a Danish chemist, contemplated this query while he worked at the laboratories of a industrial brewery in Copenhagen. It was in 1909 that he developed a method of quantifying acidity, now which is known as the pH scale. His scale works with the aid of genuinely changing the concentration of hydrogen ions in a technique to a number of between 0(zero) and 14. If a chemical is an acidic, then its pH will always be below the 7 on the scale. The lower of the number is the higher of the hydrogen ion concentration. The pH scale is a logarithmic one, meaning that one unit difference on the scale, say from 3 to 2, means a tenfold difference in H+ concentration. But zero to seven is only half of the scale.

pH value of substances

pH Value

It is a measure of acidity or basicity of a solution. pH scale is used to measure pH value. It consists of value from 0 to 14. It is 7 for neutral solution and greater then 7 for basic solution and less then 7 for acidic solution.
pH=Potential of Hydrogen

pH value of some important substances
Substances pH value
Battery acid 1.0
Gastric juice 1.0 - 3.0
Soft drink 2.0 - 4.0
Lemon 2.2 - 2.4
Vinegar 2.0 - 3.0
wine 2.8
Fruit jellies 2.8- 3.4
Apple juice 2.9 - 3.3
Strawberries 3.0- 3.5
Orange juice 3.7
Tomato 4.0- 4.5
Bear 4.5
Coffee 5.0
Tea 5.5
Acid Rain < 5.5
Peas 5.8 - 6.4
Urine(human) 6.0
Butter 6.1- 6.5
Maple syrup 6.5 - 7.0
Rain water 6.0
Cow milk 6.3 - 6.6
Saliva(human) 6.5 - 7.4
Water 7.0
Salt 7
Blood plasma(human) 7.30 - 7.40
Tears 7.4
Egg white 7.6 - 8.0
Sea water 8.4
Milk of magnesia 10.5
Laundry ammonia 11.0
Lime water 12.0



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