Question

100 БАЛОВ Розчинність кальцій нітрату при 40 С становить 189 г на 100 г води. Визначити масу води, в якій за даної температури слід розчинити 250 г цієї солі, щоб утворився насичений розчин. Обчислити масу утвореного розчину.

Answer 1

Объяснение:

40-189

?-250

делаем пропорцию

?/40-189/250

40×189÷259

=30,24)

помогла? нет?

Answer 2

Calculation of the Mass of Water and the Mass of the Saturated Solution

To determine the mass of water required to dissolve 250 g of calcium nitrate at a temperature of 40°C, we need to use the given solubility data. According to the information provided, the solubility of calcium nitrate at 40°C is 189 g per 100 g of water.

Let's assume that the mass of water required to dissolve 250 g of calcium nitrate is x grams. Since the solubility is given in terms of 100 g of water, we can set up the following proportion:

189 g / 100 g = 250 g / x g

To solve for x, we can cross-multiply and then divide:

189 g * x g = 100 g * 250 g

x = (100 g * 250 g) / 189 g

Now, let's calculate the value of x:

x = (100 g * 250 g) / 189 g ≈ 132.28 g

Therefore, the mass of water required to dissolve 250 g of calcium nitrate at 40°C is approximately 132.28 g.

Calculation of the Mass of the Saturated Solution

To calculate the mass of the saturated solution, we need to add the mass of the solute (calcium nitrate) to the mass of the solvent (water). In this case, the mass of the solute is given as 250 g.

Therefore, the mass of the saturated solution is:

Mass of the saturated solution = Mass of water + Mass of solute

Mass of the saturated solution = 132.28 g + 250 g

Mass of the saturated solution ≈ 382.28 g

Hence, the mass of the saturated solution is approximately 382.28 g.

Please note that the calculations provided are based on the given solubility data and assumptions made.