Soap Lake has a long history as a healing area. Indian people would put aside their rivalries as soon as they pertained to the lake to enjoy the high mineral content of the water. In the days before good antibiotics, hundreds of travellers would certainly come and also gain the soopoint waters of the lake. Soap Lake is alkaline, with water high quality though to be comparable to that of the moons of the planet Jupiter.

You are watching: For each of the following strong base solutions, determine [oh−],[h3o+], ph, and poh.

The pOH Concept

Just like the hydrogen-ion concentration, the concentration of the hydroxide ion have the right to be expressed logarithmically by the pOH. The pOH of a solution is the negative logarithm of the hydroxide-ion concentration:

< extpOH = - extlog left< ceOH^- ight>>

The pH of a solution have the right to be pertained to the pOH. Consider a solution via a pH (= 4.0). The (left< ceH^+ ight>) of the solution would be (1.0 imes 10^-4 : extM). Dividing (K_ extw) by this returns a (left< ceOH^- ight>) of (1.0 imes 10^-10 : extM). Finally the pOH of the solution equates to (- extlog left( 1.0 imes 10^-10 ight) = 10). This example illustrates the following partnership.

< extpH + extpOH = 14>

The pOH scale is similar to the pH range in that a pOH of 7 is indicative of a neutral solution. A standard solution has actually a pOH much less than 7, while an acidic solution has a pOH of greater than 7. The pOH is convenient to usage when finding the hydroxide ion concentration from a solution with a recognized pH.

Example (PageIndex1)

Find the hydroxide concentration of a solution with a pH of 4.42.


Step 1: List the known values and plan the difficulty.


pH (= 4.42) pH (+) pOH (= 14)


(left< ceOH^- ight> = ? : extM)

First, the pOH is calculated, followed by the (left< ceOH^- ight>).

Tip 2: Solve.

<eginalign extpOH &= 14 - extpH = 14 - 4.42 = 9.58 \ left< ceOH^- ight> &= 10^- extpOH = 10^-9.58 = 2.6 imes 10^-10 : extM endalign>

Step 3: Think around your result.

The pH is that of an acidic solution, and the resulting hydroxide-ion concentration is less than (1 imes 10^-7 : extM). The answer has actually two substantial numbers bereason the provided pH has 2 decimal places.

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The diagram listed below reflects every one of the interrelationships between (left< ceH^+ ight>), (left< ceOH^- ight>), pH, and pOH.

for each of the following strong base solutions determine [oh−] [h3o+] ph and poh.