The Amazing World of Solutes Solvents and Solutions Class 8 Long Question Answer
hardThe Amazing World of Solutes Solvents and Solutions Class 8 Long Question Answer
The Amazing World of Solutes Solvents and Solutions Class 8 Long Question Answer
Question 1.
Explain the concept of solubility and how temperature affects it. Provide an example of a solute and solvent pair to illustrate your answer.
Answer:
Solubility is the maximum amount of solute that can dissolve in a solvent at a specific temperature. As temperature increases, the solubility of most solids, like sugar in water, also increases, allowing more solute to dissolve. However, for gases, solubility typically decreases with rising temperature. For example, carbon dioxide (CO2) is more soluble in cold water than in hot water.
Examples from real life
Example 1: Saltwater
Answer:
When you dissolve table salt (NaCl) in water, you create saltwater, which is a solution. In this case, water is the solvent, and salt is the solute. This solution is not only important for cooking but also for marine life. The ocean, which is primarily saltwater, supports a vast ecosystem where fish and other aquatic organisms flourish. The dissolved salts in the ocean help to maintain the density of seawater, which is crucial for ocean currents and climate regulation.
Example 2: Carbonated Beverages
Answer:
When you open a can of soda, you release the pressure that keeps carbon dioxide ( $\mathrm{CO}_2$ ) dissolved in the liquid. Here, the soda is the solvent, and carbon dioxide is the solute. This process creates bubbles as the gas escapes, which is why soda fizzes. The dissolved carbon dioxide gives the drink its characteristic tangy taste and refreshing quality. Interestingly, colder sodas can hold more dissolved gas, which is why they tend to be fizzier when served chilled.
Example 3: Oral Rehydration Solution (ORS)
Answer:
An Oral Rehydration Solution (ORS) is a simple yet effective mixture used to treat dehydration, especially in cases of diarrhoea. It consists of water (the solvent), salt (the solute), and sugar (another solute). When mixed together, they form a solution that helps replenish lost fluids and electrolytes in the body. This solution is crucial in many parts of the world, especially in regions where access to medical care is limited.