Difference between pH and poH measurements

En Ok Pool Reform, in this section within the Swimming pool pH level we will treat the difference between ph and poh in pool water values.

What is pH in a pool and what should its levels be?

What does ideal pH for swimming pools mean (7,2-7,4)?

The acronym pH means hydrogen potential and is a measure that indicates the acidity or basicity of water.

Then, pH refers to the hydrogen potential, a value that corresponds to the concentration of hydrogen ions in the water of your pool and consequently is the coefficient that indicates the degree of acidity or basicity of the water. Therefore, pH is responsible for indicating the concentration of H+ ions in water, determining its acidic or basic character.

Pool water pH value scale

What values ​​does the pool water pH measurement scale include?

• The pH measurement scale includes values ​​from 0 to 14.
• Particularly, 0 being the most acidic, 14 being the most basic and placing the Neutral pH at 7.
• This measurement is determined by the number of free hydrogen ions (H+) in the substance.

Why do we need pH?

pH is a measurement used to specify the acidity or basicity of an aqueous solution. Whether an aqueous solution reacts as an acid or a base depends on its hydrogen ion (H+) content.

However, even chemically pure and neutral water contains some hydrogen ions due to the self-dissociation of water.

It is known that at equilibrium under standard conditions (750 mmHg and 25°C), 1 L of pure water contains  mol  y  mol  ions, therefore water at standard temperature and pressure (STP) has a pH of 7.

What to do when the pH of our pool is NOT regulated

Guides on how to maintain the pool in addition to pH: cleaning and disinfecting the water

Acidic, neutral and alkaline pH values

Classification of pH Value Scale

What are the pH values?

The pH scale goes from 1 to 14, with pH 7 being the neutral solution.

So, it turns out that pH is a value that is expressed with a logarithmic scale between the values ​​0 (extremely acidic) and 14 (extremely alkaline); In between we find the value 7 classified as neutral.

pH scale universal ph indicator

What does it mean for a substance to have an acidic or alkaline pH level?

What are acids and bases?

Acids and bases are substances that exist in nature and are distinguished by their pH level, that is, by their degree of acidity or alkalinity. The determination of whether substances are acidic or alkaline is governed by the degree of acidity or alkalinity, measured through the pH scale and goes from 0 (extremely acidic) to 14 (extremely alkaline). Both, however, are usually substances corrosive, often toxic, which nevertheless have numerous industrial and human applications.

Differences between pH and pOH values

How are they related and what are the differences between ph and poh measurements?

Of course, the activity of the ions depends on the concentration of ions and this is described by the equation

The activity coefficient is a function of ion concentration and approaches 1 as the solution becomes increasingly dilute.

For dilute (ideal) solutions, the standard state of the solute is 1,00 M, so its molarity is equal to its activity.

Therefore, for most problems that assume ideal solutions we can use the base 10 logarithm of the molar concentration, not the activity.

Divergences between what the pH value and the pOH are

What is the normal pH value?

• In some ways, pH is a measure that It is used to establish the level of acidity or alkalinity of a solution. The “p” is for “potential”, that is why the pH is called: hydrogen potential.

What is the pOH value?

• For his part. pOH is a measure of the concentration of hydroxyl ions in a solution. It is expressed as the negative base 10 logarithm of the concentration of hydroxyl ions and, unlike pH, is used to measure the level of alkalinity of a solution.

How is the pH or pOH value calculated?

What is the formula for ph scale values?

• As is already known, in the scientific field, the pH is the measure de the ions inside de a solution. You may have to calculate pH based on concentration. Calculate the pH Using the equation of pH: pH = -log[H3O+].

What is the formula to calculate pOH?

• Also, the pOH (or OH potential) is a measure of the basicity or alkalinity of a solution. Also se uses pH = – log [H₃O⁺] to measure the concentration of hydronium ions [H₃O⁺].

Key Equations to Calculate the pH or pOH Value

1. pH=−log[H3O+]
2. pOH=−log[OH−]
3. [H₃O⁺] = 10^-pH
4. [OH^-] = 10^-pOH
5. pH + pOH = pK_w = 14.00 at 25 °C.

What is the difference between the pH value scale and the pOH scale?

Inequalities between pH scale values

• On the one hand, the pH scale gives acidic values ​​from 1 to 6 while the pOH scale gives acidic values ​​from 8 to 14.
• Conversely, the pH scale gives basic values ​​from 8 to 14, while the pOH scale gives basic values ​​from 1 to 6.

Logarithm scale relationship of pH and pOH with their values

Ph and pOH scale connection with colors and values

• pH is the logarithm of the H ion concentration⁺, with the sign changed:
• Similarly, it is defined pOH as the logarithm of the concentration of OH ions^-, with the sign changed: The following relationship can be established between the pH and pOH.
• Basically, pH values ​​give the negative logarithm of the hydrogen ion concentration, whereas the pOH value gives the negative logarithm of the hydroxide ion concentration.

Difference between the pH and pOH value scale

Discordances between the ph value table and pOH value

After that, we provide you with a film with which you can see that pH measures the concentrations of hydrogen ions, while pOH measures the concentrations of hydroxyl anions or hydroxide ions.