Which of the following is an example of a qualitative observation?

• A. The temperature of the liquid is 25°C.
• B. The solution is blue in color.
• C. The mass of the sample is 5 grams.
• D. The volume of the gas is 2 liters.

Answer: (B)

Verified step by step guidance

1. Understand the difference between qualitative and quantitative observations. Qualitative observations describe qualities or characteristics, such as color, texture, or smell, without using numbers. Quantitative observations, on the other hand, involve measurements and numbers.
2. Review the given options to identify which ones are qualitative and which are quantitative. Look for descriptions that do not involve numerical measurements.
3. Option 1: 'The temperature of the liquid is 25°C.' - This is a quantitative observation because it involves a numerical measurement of temperature.
4. Option 2: 'The solution is blue in color.' - This is a qualitative observation because it describes the color of the solution without using numbers.
5. Option 3: 'The mass of the sample is 5 grams.' and Option 4: 'The volume of the gas is 2 liters.' - Both are quantitative observations as they involve numerical measurements of mass and volume, respectively.