High School

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What does the results table indicate about the solute in this solution?

[tex]
\[
\begin{array}{|c|c|}
\hline
\text{Temp} \left({ }^{\circ} C \right) & \text{Concentration} \left(\frac{g \text{ solute}}{\text{mL solvent}}\right) \\
\hline
18.5 & 1.43 \\
\hline
37.9 & 0.81 \\
\hline
59.3 & 0.30 \\
\hline
80.1 & 0.21 \\
\hline
\end{array}
\]
[/tex]

A. The solute is a GAS because the amount dissolved INCREASES as temperature increases.

B. The solute is a SOLID because the amount dissolved DECREASES as temperature increases.

C. The solute is a GAS because the amount dissolved DECREASES as temperature increases.

D. The solute is a SOLID because the amount dissolved INCREASES as temperature increases.

Answer :

To determine the nature of the solute based on the given data, let’s look at how the concentration changes with temperature.

Here's the data we have:

- At 18.5°C, the concentration is 1.43 g/mL.
- At 37.9°C, the concentration is 0.81 g/mL.
- At 59.3°C, the concentration is 0.30 g/mL.
- At 80.1°C, the concentration is 0.21 g/mL.

Analysis:

1. Understand the Trend: As the temperature increases from 18.5°C to 80.1°C, the concentration of the solute decreases.

2. What Does This Mean?
- If a solute is a gas, it typically dissolves more in the solvent at lower temperatures. As the temperature rises, gases tend to become less soluble.
- Conversely, many solid solutes become more soluble in a solvent as the temperature increases.

Here, we see that the concentration decreases as the temperature increases, indicating that the solubility of the solute is decreasing with rising temperature.

Conclusion:

Based on this decrease in concentration with increasing temperature, it suggests that the solute is a gas. Gases generally dissolve less in liquids as the temperature increases. Therefore, the correct conclusion is:

"The solute is a GAS because the amount dissolved DECREASES as temperature increases."

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