Calculate The Values Of Both Ph And Poh Of The Following Solutions

pH and pOH Equations:

\[ pH = -\log[H⁺] \] \[ pOH = 14 - pH \]

pH:

pOH:

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1. What Are pH and pOH?

pH and pOH are logarithmic measures of the acidity and basicity of aqueous solutions. pH represents the negative logarithm of hydrogen ion concentration, while pOH represents the negative logarithm of hydroxide ion concentration. At 25°C, pH + pOH = 14.

2. How Does the Calculator Work?

The calculator uses the pH and pOH equations:

\[ pH = -\log[H⁺] \] \[ pOH = 14 - pH \]

Where:

\( [H⁺] \) — Hydrogen ion concentration (mol/L)
\( pH \) — Measure of acidity (0-14 scale)
\( pOH \) — Measure of basicity (0-14 scale)

Explanation: The equations provide a convenient way to express the very small concentrations of hydrogen and hydroxide ions in aqueous solutions using a simple numerical scale.

3. Importance of pH and pOH Calculation

Details: Accurate pH and pOH calculations are essential in chemistry, biology, environmental science, and many industrial processes. They help determine solution acidity/basicity, predict chemical behavior, and maintain optimal conditions for biological systems.

4. Using the Calculator

Tips: Enter hydrogen ion concentration in mol/L. The value must be positive and greater than zero. The calculator will automatically compute both pH and pOH values.

5. Frequently Asked Questions (FAQ)

Q1: What is the relationship between pH and pOH?
A: At 25°C, pH + pOH = 14. This relationship holds true for all aqueous solutions at this temperature.

Q2: What are typical pH values for common substances?
A: Pure water has pH 7, lemon juice ~2.4, baking soda solution ~8.3, and household bleach ~12.5.

Q3: Why use logarithmic scale for pH?
A: The logarithmic scale compresses the wide range of hydrogen ion concentrations (from 1 to 10⁻¹⁴ mol/L) into a manageable 0-14 scale.

Q4: Does temperature affect pH and pOH?
A: Yes, the pH + pOH relationship changes with temperature. At 25°C it equals 14, but this value varies at other temperatures.

Q5: How accurate are these calculations?
A: The calculations are mathematically precise based on the input concentration. However, actual measurements may vary due to experimental conditions and other factors.