how do you put the equation in the calculator for PH or POH

Expert Solution

Hi we know the relationships

pH = -log(H⁺) and pOH = -log(OH^-)

H⁺ and OH^- are hydrogen ion concentration and hydroxyl ion concentration respectively. Concentration should be in moles only.

Sample Question: Calculate pH of 0.001 M HCl.

Procedure: Volume is not given hence molarity = moles (we have to assume the volume is 1 liter)

concentration = 0.001 M = 0.001 moles (since molarity = moles/liter)

pH = -log(H⁺) = negative logarithm of hydrogen ion concentration = -log(0.001) = 3

so pH = 3

1. In calculator press "minus" sign, next press "log" a open bracket appears as -log(

2. now enter the value 0.001, next press ) button, final press on equality symbol "=" it gives the required result.

The same process is also applicable to calculate pOH also, but finally you have to convert pOH into pH by using the following equality relationship.

pH + pOH = 14 ==> pH = 14 - pOH

Still if you have any other doubts please feel free to contact me via comments section below my friend.

Thank You So Much! Please Rate this answer as you wish.

queen_honey_blossom answered 2 years ago

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