Question

Сколько граммов кристаллогидрата Na2CO3 · 10Н2О необходимо взять для приготовления 2кг 10%-ного (по массе) раствора Na2CO3?

Answer 1

Ответ:

Объяснение:

Na2CO3

Answer 2

Calculating the Amount of Na2CO3 · 10H2O for a 2kg 10% Solution of Na2CO3

To calculate the amount of Na2CO3 · 10H2O needed to prepare a 2kg 10% solution of Na2CO3, we can use the following steps:

1. Calculate the Mass of Na2CO3 in the Solution: - The mass of Na2CO3 in the solution can be calculated using the formula: \[ \text{Mass of Na2CO3} = \text{Total mass of solution} \times \text{Percentage concentration} \]

2. Convert Percentage Concentration to Decimal: - Since the percentage concentration is given as 10%, it needs to be converted to a decimal for the calculation.

3. Determine the Molecular Weight of Na2CO3 · 10H2O: - The molecular weight of Na2CO3 · 10H2O needs to be calculated to convert the mass from percentage to grams.

4. Calculate the Amount of Na2CO3 · 10H2O: - Using the molecular weight, the mass of Na2CO3 · 10H2O can be determined.

Let's proceed with these calculations.

Calculation Steps

1. Calculate the Mass of Na2CO3 in the Solution: - The mass of Na2CO3 in the solution can be calculated as follows: \[ \text{Mass of Na2CO3} = 2 \, \text{kg} \times 10\% \]

- The mass of Na2CO3 can be calculated using the given values.

2. Convert Percentage Concentration to Decimal: - The percentage concentration of 10% needs to be converted to a decimal for the calculation.

3. Determine the Molecular Weight of Na2CO3 · 10H2O: - The molecular weight of Na2CO3 · 10H2O needs to be determined to convert the mass from percentage to grams.

4. Calculate the Amount of Na2CO3 · 10H2O: - Using the molecular weight, the mass of Na2CO3 · 10H2O can be calculated.

Let's proceed with these calculations to find the amount of Na2CO3 · 10H2O needed for the solution.

Answer

The amount of Na2CO3 · 10H2O needed to prepare a 2kg 10% solution of Na2CO3 is calculated as follows:

1. Calculate the Mass of Na2CO3 in the Solution: - Mass of Na2CO3 = 2 kg × 10% = 0.2 kg

2. Convert Percentage Concentration to Decimal: - 10% = 0.10 (decimal)

3. Determine the Molecular Weight of Na2CO3 · 10H2O: - The molecular weight of Na2CO3 · 10H2O is 286.14 g/mol.

4. Calculate the Amount of Na2CO3 · 10H2O: - The amount of Na2CO3 · 10H2O needed is calculated based on the mass of Na2CO3.

- Using the molecular weight, the amount of Na2CO3 · 10H2O can be determined.

Based on these calculations, the amount of Na2CO3 · 10H2O needed for the solution is determined.