Parshotam
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[H+] shows the concentration of hydrogen ion. pH is negative log of hydrogen ion concentration
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This is correct formula to culclate the pH of the solution. pH= - log ( H+)
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As we know the pH + pOH = 14 , if you know the concentration of thesoluton you may calculate easily pH of solution as well as pOH. Here is formula for the determination of pH, pH = log ( H+) and you may put the determined value of pH in the equation of pH + pOH = 14 , and get the value of pOH. We can reduce the pH of the soultion by adding any kind of acid, if we use acid its pH may reduce to1 or even 0, it means the concentration of Hydrogen ions will be increased. You may detect the pH of the solution by unversal indicator paper and pH meter.