Calculate The Ph of The Following Aqueous Solution

The pH of an aqueous solution is a measure of its acidity or alkalinity. This calculator helps you determine the pH of a solution based on its hydrogen ion concentration or hydroxide ion concentration.

What is pH?

The pH scale is a logarithmic measure of the acidity or alkalinity of an aqueous solution. It ranges from 0 to 14, where:

pH values less than 7 are acidic
pH 7 is neutral
pH values greater than 7 are alkaline (basic)

The pH scale is logarithmic, meaning each whole number change represents a tenfold difference in hydrogen ion concentration. For example, a solution with pH 4 has 10 times the hydrogen ion concentration of a solution with pH 5.

How to Calculate pH

The pH of a solution can be calculated using the following formulas:

For Acidic Solutions

pH = -log₁₀[H⁺]

Where [H⁺] is the concentration of hydrogen ions in moles per liter (M).

For Alkaline Solutions

pH = 14 + log₁₀[OH^-]

Where [OH^-] is the concentration of hydroxide ions in moles per liter (M).

These formulas are based on the fact that water (H₂O) ionizes to form hydrogen ions (H⁺) and hydroxide ions (OH^-) in a reversible reaction:

H₂O ⇌ H⁺ + OH^-

The product of the concentrations of H⁺ and OH^- is always 1 × 10^-14 M² at 25°C.

Using this relationship, you can calculate the pH of a solution if you know either the hydrogen ion concentration or the hydroxide ion concentration.

The pH Scale

The pH scale is a logarithmic scale that measures the acidity or alkalinity of a solution. The scale ranges from 0 to 14, with:

pH 0 being the most acidic
pH 7 being neutral
pH 14 being the most alkaline

Each whole number change on the pH scale represents a tenfold difference in hydrogen ion concentration. For example, a solution with pH 4 has 10 times the hydrogen ion concentration of a solution with pH 5.

Common pH values for everyday substances include:

Battery acid: ~0.8
Stomach acid: ~1.0 to 3.0
Lemon juice: ~2.0
Pure water: 7.0
Human blood: ~7.4
Baking soda solution: ~8.3
Ammonia solution: ~11.6
Household bleach: ~12.5

Common pH Values

Here are some common pH values for everyday substances:

Substance	pH Range
Battery acid	0.8
Stomach acid	1.0 to 3.0
Lemon juice	2.0
Pure water	7.0
Human blood	7.4
Baking soda solution	8.3
Ammonia solution	11.6
Household bleach	12.5

These values can help you understand the acidity or alkalinity of common substances and solutions.

FAQ

What is the pH scale?: The pH scale is a logarithmic measure of the acidity or alkalinity of an aqueous solution. It ranges from 0 to 14, where pH values less than 7 are acidic, pH 7 is neutral, and pH values greater than 7 are alkaline.
How do I calculate the pH of a solution?: You can calculate the pH of a solution using the formula pH = -log₁₀[H⁺] for acidic solutions or pH = 14 + log₁₀[OH^-] for alkaline solutions, where [H⁺] is the concentration of hydrogen ions and [OH^-] is the concentration of hydroxide ions.
What is the difference between pH and pOH?: The pH of a solution is a measure of its acidity, while the pOH is a measure of its alkalinity. The sum of pH and pOH is always 14 for aqueous solutions at 25°C.
What is the pH of pure water?: The pH of pure water is 7 at 25°C, which is considered neutral.
What are some common pH values?: Common pH values for everyday substances include battery acid (~0.8), stomach acid (~1.0 to 3.0), lemon juice (~2.0), pure water (7.0), human blood (~7.4), baking soda solution (~8.3), ammonia solution (~11.6), and household bleach (~12.5).