What is the pH range and color of a strong acid indicated by a universal indicator?

What is the pH range and color of a strong acid indicated by a universal indicator?

• A. 7, green
• B. 1-3, red
• C. 4-6, yellow
• D. 8-10, blue

Answer: (B)

A strong acid is characterized by a lower pH value, typically ranging from 1 to 3. This is due to the high concentration of hydrogen ions (H⁺) present, which results in a more acidic solution. When using a universal indicator to determine the pH, this range corresponds to a red color. Universal indicators are designed to show a spectrum of colors for different pH levels, facilitating the identification of acidity or basicity in solutions. Therefore, the red color at a pH of 1 to 3 clearly signals the presence of a strong acid, aligning perfectly with the chemical properties of such substances. The other options do not accurately reflect the characteristics of strong acids: a pH of 7 would indicate neutrality, pH levels of 4-6 suggest weak acidity, and a pH of 8-10 would point towards basicity. Thus, the correlation between the pH range and color in the context of strong acids is clearly represented by the choice indicating a pH of 1-3 and a red color.

A strong acid is characterized by a lower pH value, typically ranging from 1 to 3. This is due to the high concentration of hydrogen ions (H⁺) present, which results in a more acidic solution. When using a universal indicator to determine the pH, this range corresponds to a red color.

Universal indicators are designed to show a spectrum of colors for different pH levels, facilitating the identification of acidity or basicity in solutions. Therefore, the red color at a pH of 1 to 3 clearly signals the presence of a strong acid, aligning perfectly with the chemical properties of such substances.

The other options do not accurately reflect the characteristics of strong acids: a pH of 7 would indicate neutrality, pH levels of 4-6 suggest weak acidity, and a pH of 8-10 would point towards basicity. Thus, the correlation between the pH range and color in the context of strong acids is clearly represented by the choice indicating a pH of 1-3 and a red color.