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Questions and Answers
What is the definition of mass percentage (w/w) of a component in a solution?
What is the definition of mass percentage (w/w) of a component in a solution?
- Mass % of a component = Mass of the component in the solution + Total mass of the solution
- Mass % of a component = (Mass of the component in the solution / Total mass of the solution) x 100 (correct)
- Mass % of a component = (Total mass of the solution / Mass of the component in the solution) x 100
- Mass % of a component = Mass of the component in the solution - Total mass of the solution
In which situations is qualitative description of concentration inadequate?
In which situations is qualitative description of concentration inadequate?
- When dealing with industrial chemical applications
- When precise quantitative information is needed (correct)
- When discussing dilute solutions
- When discussing concentrated solutions
What does it mean when a solution is described as '10% glucose in water by mass'?
What does it mean when a solution is described as '10% glucose in water by mass'?
- 10 g of water is dissolved in 90 g of glucose resulting in a 100 g solution
- 10 g of glucose is dissolved in 10 g of water resulting in a 20 g solution
- 10 g of glucose is dissolved in 90 g of water resulting in a 100 g solution (correct)
- 10 g of water is dissolved in 90 g of glucose resulting in a 200 g solution
Why is quantitative description necessary for describing concentration?
Why is quantitative description necessary for describing concentration?
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What is the definition of volume percentage (V/V) of a component in a solution?
What is the definition of volume percentage (V/V) of a component in a solution?
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Study Notes
Concentration of Solutions
- Mass Percentage (w/w): The proportion of the mass of a component in a solution to the total mass of the solution, expressed as a percentage.
Limitations of Qualitative Description
- Inadequate situations: Qualitative description of concentration is insufficient when accurate measurements are required, such as in scientific research, medical applications, and precise chemical reactions.
Solution Composition
- '10% glucose in water by mass': Means that 10 grams of glucose are present in every 100 grams of the solution, which is a quantitative description of the concentration.
Importance of Quantitative Description
- Necessity: Quantitative description is necessary for describing concentration because it provides precise and accurate measurements, which are crucial in various scientific and practical applications.
Volume Percentage (V/V)
- Definition: The proportion of the volume of a component in a solution to the total volume of the solution, expressed as a percentage.
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