Question

Казеиновый клей приготовили из порошка клея массой 500 г в воде,нагретой до температуры 60-70°С объёмом 1 л.Определите массовую долю клея в данном растворе..Объясните,каким образом приготовить данный раствор массой 1,5 кг?Ответить на все вопросы!Пож))

Answer 1

Плотность воды при 60° = 0,98318 г/мл (справочные данные взяты из интернета)
1 л = 1 000 мл
m(H₂O) = 1 000 мл * 0,98318 г/мл = 983,18 г
m(р-ра клея) = 500 г + 983,18 = 1 483,18 г
w%(клея) = 500 г : 1 483,18 = 33,71%


Чтобы приготовить 1,5 кг клея с массовой долей клея 33,71%, нужно 1 л 11 мл воды подогреть до 60°, всыпать в нее 505,65 г клея и хорошо перемешать.
m(клея) = 1 500 г * 33,71 % : 100 % = 505,65 г
m(H₂O) = 1 500г - 505,65 = 994,35 г
V(H₂O) = 994,35 г : 0,98318 г/моль = 1 011 мл = 1 л 11 мл

Answer 2

Calculating the Mass Fraction of Glue in the Solution

To determine the mass fraction of glue in the solution, we can use the formula:

Mass Fraction = (Mass of Glue / Total Mass of Solution) * 100%

Given: - Mass of glue powder = 500 g - Volume of water = 1 L - Temperature of water = 60-70°C

First, we need to find the mass of the solution. Then, we can calculate the mass fraction of the glue in the solution.

The density of water changes with temperature, so we will consider the average density for the given temperature range.

Calculating the Mass of the Solution

The density of water at 60-70°C is approximately 0.9854 g/cm³.

The volume of 1 L of water at this temperature can be converted to mass using the density:

Mass of Water = Volume * Density

Mass of Water = 1 L * 0.9854 g/cm³ = 985.4 g

The total mass of the solution is the sum of the mass of the glue and the mass of the water:

Total Mass of Solution = Mass of Glue + Mass of Water

Total Mass of Solution = 500 g + 985.4 g = 1485.4 g

Calculating the Mass Fraction of Glue in the Solution

Now, we can use the formula to find the mass fraction of the glue in the solution:

Mass Fraction = (500 g / 1485.4 g) * 100%

Mass Fraction ≈ 33.67%

Therefore, the mass fraction of the glue in the solution is approximately 33.67%.

Preparing a Solution with a Mass of 1.5 kg

To prepare a solution with a mass of 1.5 kg, we can use the same mass fraction to calculate the mass of glue needed for the new solution.

Mass of Glue = Mass Fraction * Total Mass of Solution

Mass of Glue = 0.3367 * 1500 g

Mass of Glue ≈ 505.05 g

To prepare the solution with a mass of 1.5 kg, you would need approximately 505.05 g of glue powder.

I hope this helps! If you have further questions, feel free to ask!