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Calculate The Ph of The Following Aqueous Solution 0.74 M

Reviewed by Calculator Editorial Team

Determine the pH of a 0.74 M aqueous solution using the calculator and guide. Learn how to calculate pH from molarity, understand acid-base equilibria, and interpret results.

How to Calculate pH

The pH of a solution is a measure of its acidity or basicity. For a strong acid or base, the pH can be calculated directly from the molarity (M) of the solution using the following steps:

  1. Determine the molarity (M) of the solution in moles per liter.
  2. Calculate the hydrogen ion concentration ([H+]) in moles per liter.
  3. Take the negative logarithm (base 10) of the hydrogen ion concentration to find the pH.

For a strong acid like hydrochloric acid (HCl), the hydrogen ion concentration is equal to the molarity of the solution. For a strong base like sodium hydroxide (NaOH), the hydroxide ion concentration is equal to the molarity, and the pH can be calculated from the hydroxide ion concentration.

pH Calculation Formula

The pH of a strong acid solution can be calculated using the following formula:

pH = -log₁₀[H⁺]

Where:

  • pH is the measure of acidity or basicity
  • [H⁺] is the hydrogen ion concentration in moles per liter (M)

For a strong acid, the hydrogen ion concentration is equal to the molarity of the solution:

[H⁺] = M

This formula applies to strong acids and bases. For weak acids or bases, additional calculations involving equilibrium constants are required.

Worked Example

Let's calculate the pH of a 0.74 M hydrochloric acid (HCl) solution:

  1. Identify the molarity: M = 0.74 M
  2. For a strong acid, [H⁺] = M = 0.74 M
  3. Calculate pH: pH = -log₁₀(0.74) ≈ 0.13

The pH of a 0.74 M HCl solution is approximately 0.13, indicating a very acidic solution.

Interpreting Results

The pH scale ranges from 0 to 14:

  • pH < 7: Acidic solution
  • pH = 7: Neutral solution
  • pH > 7: Basic solution

A pH of 0.13 indicates a highly acidic solution. This means the solution contains a very high concentration of hydrogen ions, which can be dangerous and corrosive.

Always handle acidic solutions with care. Wear protective gloves and eyewear, and work in a well-ventilated area.

FAQ

What is the pH of a 0.74 M solution?
The pH of a 0.74 M strong acid solution is approximately 0.13.
Can I use this calculator for weak acids?
No, this calculator is designed for strong acids and bases. For weak acids, you would need to use additional calculations involving equilibrium constants.
What does a pH of 0.13 mean?
A pH of 0.13 indicates a highly acidic solution with a very high concentration of hydrogen ions.
Is a pH of 0.13 safe to handle?
No, a pH of 0.13 indicates a highly corrosive and dangerous solution that should be handled with appropriate protective equipment.
What is the difference between pH and pOH?
pH measures the concentration of hydrogen ions (H⁺), while pOH measures the concentration of hydroxide ions (OH⁻). The sum of pH and pOH is always 14 in water at 25°C.