Two questions on colligative properties.

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In summary, the conversation is about two problems related to heating solutions and finding the mass percentages and amount of glucose needed for a specific boiling point. One problem involves finding the mass percentages of a sucrose solution at the "soft-ball" stage, while the other problem involves calculating the amount of glucose needed to raise the boiling point of water to a specific temperature.
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Homework Statement


Could anyone help me with these two problems? The answer for the first one is 89.5%- 91.2% and the second one is 213 grams of glucose, but I didn't get those answers.

1. In making candy, a certain recipe calls for heating an aqueous sucrose solution to the "soft-ball" stage which has a boiling point of 235-240 degrees Fahrenheit. What is the range of mass percentages of the solutions of sugar (C12H22O11) that boil at those two temperatures? (Hint: Remember that temperature changes are in Celsius)
2. How many grams of glucose (molar mass= 180.9 g/mol) must be dissolved in 255 g of water to raise the boiling point to 102.36 deg. Celsius?


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Hi mikepl1, Welcome to PF!

As per the forum rules, you need to show us your attempt at the problem before asking for help. :)
 

Related to Two questions on colligative properties.

1. What are colligative properties?

Colligative properties are physical properties of a solution that depend on the concentration of solute particles, rather than the chemical identity of the solute. These properties include freezing point depression, boiling point elevation, vapor pressure lowering, and osmotic pressure.

2. How do colligative properties affect a solution?

Colligative properties affect a solution by changing its physical properties, such as its freezing and boiling points. These changes are caused by the presence of solute particles, which disrupt the solvent's ability to form bonds and reduce its vapor pressure.

3. Why do colligative properties depend on the concentration of solute particles?

Colligative properties depend on the concentration of solute particles because the more particles present, the greater the disruption of the solvent's properties. This is due to the fact that the solute particles take up space and interfere with the solvent's ability to form bonds.

4. How are colligative properties measured?

Colligative properties are measured by comparing the properties of a pure solvent with those of a solution containing a known concentration of solute particles. The difference between the two values is used to calculate the degree of change caused by the solute particles.

5. What are some real-life applications of colligative properties?

Colligative properties have many real-life applications, such as in antifreeze solutions for cars, where freezing point depression prevents the engine from freezing in cold temperatures. They are also used in the production of ice cream, where lowering the freezing point of water allows the mixture to solidify at a colder temperature, resulting in a smoother texture. Osmotic pressure is utilized in water purification processes, and boiling point elevation is used in the production of saltwater taffy.

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