ph scale of water if 7 then why is it colourless?
Answers
The components present in the water let light pass through it completely of reflect completely, i.e It doesnt let to emit any specific light, which is the reason water seems colourless.
pH stands for 'potential of Hydrogen' which measure the acidity or alkalinity of water soluble substances. It is measured with a logarithmic scale known as pH. In 1909, a danish biochemist S.P.L Sorenson devised a scale pH to represents the H+ ion concentration of an aqueous solution.
Do you know what is acid and base?
An acid is a substance that donates hydrogen ions that is when in a solution there are more hydrogen ions than hydroxide ions, the solution will be acidic.
A base is a substance that accepts hydrogen ions that is when in a solution there are more hydroxide ions than hydrogen ions, the soulution will be alkaline.
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 solution is referred to as the negative logarithm of hydrogen ion.
pH = -log [H+]
= log 1/ [H+]
Basic concept of pH value
pH of Neutral Solution (Pure Water): pH of water is 7. Whenever the pH of a solution is 7, it will be a neutral solution. Such a solution will have no effect on any litmus solution or any other indicator.
pH of an Acidic Solution: All the acidic solutions have a pH less than 7. So, whenever a solution has a pH less than 7, it will be acidic in nature and it will turn blue litmus into red as well as methyl orange pink and phenolphthalein colourless.
pH of a basic solution: All the alkaline solution have a pH of more than 7. So, 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.
BECOZ the ph value is neutral....