# Question: How do I calculate pH?

Contents

To calculate the pH of an aqueous solution you need to know the concentration of the hydronium ion in moles per liter (molarity). The pH is then calculated using the expression: pH = - log [H3O+].

## What is the formula for the pH?

Calculating pH pH is defined by the following equation, pH = −log [H+] , where [H+] denotes the molar hydrogen ion concentration. Notice that we are required to take the common (base 10) logarithm of the hydrogen ion concentration in order to calculate pH.

## How do you calculate pH on a calculator?

0:542:53Calculating pH - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo youre just going to have the pH equals the negative log of nine point two times ten to the minusMoreSo youre just going to have the pH equals the negative log of nine point two times ten to the minus thirteen. And now I need to put that in my calculator.

## How do you calculate pH and pOH?

In order to calculate the pH, take the negative log of the hydronium ion concentration. To find the pOH, simply subtract the pH from 14. In order to calculate the pOH, take the negative log of the hydroxide ion concentration. To find the pH, simply subtract pOH from 14.

## How do you find the pH of a math problem?

0:298:37Given pH & pOH, Solve for [H+] & [OH-] Practice Problems - YouTubeYouTubeStart of suggested clipEnd of suggested clipHere 2.3 gets substituted from the pH. The Poh is going to be something were solving for and wantMoreHere 2.3 gets substituted from the pH. The Poh is going to be something were solving for and want to add them up theyre going to equal 14. When I subtract 14. And 2.3.

## Is it possible to have a pH of 15 or?

But the scale does not have fixed limits, so it is indeed possible to have a pH above 14 or below zero. For example, concentrated hydrochloric acid can have a pH of around -1, while sodium hydroxide solution can have a pH as high as 15.

## What does it mean if the pH is 7?

pH is a measure of how acidic/basic water is. The range goes from 0 to 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

## What is the formula for calculating pOH?

The pOH of a solution is the negative logarithm of the hydroxide-ion concentration. by this yields a [OH − ] of 1.0 × 10 -10 M. Finally the pOH of the solution equals -log(1.0 × 10 -10 ) = 10.

## What is pOH formula?

To calculate the pOH of a solution you need to know the concentration of the hydroxide ion in moles per liter (molarity). The pOH is then calculated using the expression: pOH = - log [OH-] Example: What is the pOH of a solution that has a hydroxide ion concentration of 4.82 x 10-5 M?

## Can you have a negative pH?

If your acid solution is stronger than 1N, then you will get a pH less than 0 (a negative pH). Its possible. If the molarity of hydrogen ions is greater than 1, youll have a negative value of pH. For example, you might expect a 12 M HCl solution to have a pH of -log(12) = -1.08.

## Why is a pH of 0 or 15 Impossible?

A saturated sodium hydroxide solution (NaOH) solution is supposed to have a pH of 15 based on its molarity. However, the chemical will not be able to solvate entirely due to the presence of water, which acts as a hindrance to the solvation (breakdown) of larger molecules.

## Is a pH of 0 possible?

A solution of a strong acid, such as hydrochloric acid, at concentration 1 mol dm−3 has a pH of 0. Thus, measured pH values will lie mostly in the range 0 to 14, though negative pH values and values above 14 are entirely possible.

## What has a pH of 1?

The pH scaleIncreasing pH (Decreasing Acidity)Substances0 (most acidic)Hydrochloric acid (HCl)1Stomach acid2Lemon juice3Cola, beer, vinegar15 more rows

## Why does pH and pOH equal 14?

Explanation: pH and pOH are the log concentrations of protons and hydroxide ions, respectively. The sum of pH and pOH is always 14. This is because the product of proton concentration and hydroxide concentration must always equal the equilibrium constant for the ionization of water, which is equal to .

## What is pOH equal to?

The pOH of a solution is the negative logarithm of the hydroxide-ion concentration. pOH = -log[OH – ] The pH of a solution can be related to the pOH. Consider a solution with a pH = 4.0. The [H + ] of the solution would be 1.0 × 10 -4 M.

## What is the pOH if the pH is 4?

The pOH Concept Consider a solution with a pH = 4.0. The [H+] of the solution would be 1.0 × 10-4 M. Dividing Kw by this yields a [OH−] of 1.0 × 10-10 M. Finally the pOH of the solution equals -log(1.0 × 10-10) = 10.

## Does anything have a pH of 14?

The pH scale typically stretches from zero to 14, passing through a neutral pH7 (freshly distilled water). But the scale does not have fixed limits, so it is indeed possible to have a pH above 14 or below zero.

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