An online tool called pH Calculator displays a chemical solution’s pH value when entered. With StudyQueries’s pH calculator, you can calculate pH quickly, and the measurement appears in seconds.

How to Use pH Calculator?

To use the pH calculator, follow these steps:

  • Step 1: Enter the name of the chemical solution and its concentration value in the respective input fields
  • Step 2: Click on the “Calculate” button to obtain the pH value
  • Step 3: Finally, the pH value will be visible in a new window

pH Calculator

What is Meant by pH Measurement?

Hydrogen potential is represented by the term pH in chemistry. Acidity and alkalinity are measured by pH. This is a measure of hydrogen ion concentration, which determines the acidity or alkalinity of a chemical solution. There is usually a pH range of 0 to 14 on the pH scale.

pH Calculator Scale
pH Calculator Scale

pH values greater than 7 are considered acidic for an aqueous solution at 25°C, while pH values less than 7 are considered alkaline or base for the solution.

Consider the chemical acetic acid, which has a molecular weight of 5. Therefore, the pH value of 5M acetic acid is 2.03.

Acids and bases

pH is a measurement of the hydrogen ion concentration in a solution relative to pure water. This determines whether a solution is acidic or basic. Acidic solutions have a higher H+ concentration than water (greater than 1 × 10^{-7} M), while basic (alkaline) solutions have a lower H+ concentration (less than 1 × 10^{-7} M). Hydrogen ion concentrations in solutions are typically expressed using pH values. A pH value is calculated as the negative log of hydrogen ion concentration:​

pH Calculation
pH Calculation

We are referring to its concentration by the square brackets around the H+. If you plug the hydrogen ion concentration of water (1 × 10^{-7} M) into this equation, you’ll get a value of 7.0, also known as neutral pH. In the human body, both blood and the cytosol (watery goo) inside of cells have pH values close to neutral. Aqueous (water-based) solutions gain and lose H+ concentration as acids or bases are added.

In our context, an acid is a substance that increases the concentration of hydrogen ions (H+) in a solution, usually by dissociating one of its hydrogen atoms. By contrast, a base raises pH by removing hydrogen ions from the solution using hydroxide (OH-) or another ion or molecule. (This simplified explanation of acids and bases is best used when thinking about biology. You might also want to look at the chemistry section for more information on acids and bases.)

The stronger the acid, the more readily it dissociates to form H+. If hydrochloric acid (HCl) is placed in water, it completely dissociates into hydrogen and chloride ions, so it is considered a strong acid. Tomato juice and vinegar, on the other hand, do not completely dissociate in water and are therefore considered weak acids. Similar to strong bases, sodium hydroxide (NaOH) dissociates completely in water, releasing hydroxide ions (or other types of basic ions) capable of absorbing H+.

The pH scale

The pH scale is used to measure acidity and basicity (alkalinity) in solutions. A change in pH value corresponds to a tenfold change in the concentration of H+ ions since the scale is based on pH values. It is often said that the pH scale is 0 to 14, and most solutions do fall within this range, although it is possible to get a pH below 0 or above 14. Anything below 7.0 is acidic, while anything above 7.0 is alkaline, or basic.

Both the pH inside human cells (6.8) and the pH of blood (7.4) are very close to neutral. It is usually considered unfavorable for life for pH values to exceed or to fall below the normal range. Although your stomach is highly acidic, with a pH of 1 to 2, the environment inside it is highly alkaline. What is the stomach’s solution to this problem? Cells that can be thrown away are the answer! Cells in the stomach, especially those that come in direct contact with stomach acid and food, are constantly dying and being replaced. Approximately every seven to ten days, the stomach lining is completely replaced.

Buffers

pH needs to remain within a fairly narrow range for most organisms, including humans. As an example, human blood must maintain a pH of 7.4 or lower throughout its lifetime and avoid a significant increase in acidity or alkalinity despite other ingredients entering or leaving the bloodstream.

Stable concentrations of H+ ions in biological systems are maintained by buffers, solutions that resist pH changes. As H+ ions accumulate in the water, a buffer absorbs some of them, bringing pH back to normal. Conversely, a buffer will donate some of its own H+ ions to bring pH down.

Buffers typically consist of an acid-base pair in which the acid and base differ by the presence or absence of a proton (a conjugate acid-base pair). Carbonic acid (H2CO3) and the bicarbonate ion (HCO3-) are important buffers that maintain the pH of human blood, for example.

In the blood, carbon dioxide is dissolved into carbonic acid when it combines with water in the bloodstream and moves from the muscles (where it is generated) to the lungs (where it is converted back into water and CO2, which is released as waste).

(H+)+ HCO3-  > H2CO3

The equation above will shift right if there are too many H+ ions, and the bicarbonate ions will absorb the H+ ions to form carbonic acid. When the H+ concentration falls below a critical point, the equation has pulled the left and carbonic acid is converted to bicarbonate, which donates H+ to the solution. It would be impossible to survive if the pH of the body fluctuated enough to jeopardize survival.

Frequently Asked Questions About pH Calculator

How do you solve for pH on a calculator?

The procedure to use the pH calculator is as follows:

Step 1: Enter the chemical solution name and its concentration value in the respective input field.

Step 2: Now click the button “Calculate” to get the pH value.

Step 3: Finally, the pH value will be displayed in the new window.

What are pH and its formula?

The pH and its negative logarithm are Sorensen’s definitions of hydrogen concentration and its pH. The pH of an aqueous solution can be calculated based on the hydronium ion concentration using the equation pH=−log[H3O+].

How do you calculate H+ from pH?

In the following equation, pH = −log [H+], where [H+] denotes the molar hydrogen ion concentration. In order to calculate pH, we must take the common (base 10) logarithm of hydrogen ion concentration.

What is a pH of 10?

The pH scale ranges from 0 to 14. A pH of 7 is neutral. A pH less than 7 is acidic. A pH greater than 7 is basic.