Answer to Question #310927 in General Chemistry for jovie

Question

1. How many NaCI will dissolve in water in 400g of water at 100 degrees Celsius?

2. Approximately how many grams of NaNO3 will dissolve in 100g of water at 10 degrees Celsius?

3. How many grams of KCI will dissolve in 1 liter of H2O at 50 degrees Celsius?

4. What relationship exists between solubility and temperature for most of the substances shown?

Answer 1

1. You can determine how many grams of sodium chloride, commonly known as table salt, can be dissolved in 100 g

 оf water at 100°C by taking a look at its solubility graph.

A substance's solubility graph tells you how it's solubility changes, let's say starting from room temperature, when temperature is either decreased or increased.

At room temperature sodium chloride has a solubility of approximately 35 g/100 g H₂O.

As temperature increases, its solubility increases as well. Notice, however, that it does not increase significantly. In fact, you can expect to be able to dissolve no more than 40 g of sodium chloride per 100 g of water at 100°C.

So, at 100°C, you will have an unsaturated solution if you dissolve less than 40 g of sodium chloride, and a saturated solution if you dissolve about 40 g of sodium chloride.

In 400 g of water will dissolve 40×4=160 g of NaCl.

2. According a substance's solubility graph at 10°C in 100 g of water will dissolve 80 g of NaNO₃.

3. According a substance's solubility graph at 50°C in 100 g of water will dissolve 42 g of KCl. In 1 L of water will dissolve 42×10 = 420 g of KCl.

4. As temperature increases, salt's solubility increases as well. However, that it does not increase significantly.