Sir in module I have seen that pH of water is 7 that means 1 H3O+ is presented in 10^7 molecules of water but they Have also said that moles/litre .sir how it is moles / litre from ions / mooucumol

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Solution

concentration is expressed in molarity

molarity =moles/volume in liters

pH=-log[H3O+]
(H3O + is nothing but H+ in H2O)
if the molarity of H3O+ is 1.010^-7mol/1L that is 1.010^-7M we will get the pH 7

let me show you how
rearrange the formula to find [H3O+] molarity using pH 7

ph=-log[H3O+]
7=-log[H3O+]
antilog(-7)=[H3O+]
finding antilog you will get 1.010^-7 as molarity which is 1.010^-7moles H3O+ in 1L water.

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