Question

200г 20% раствора щелочи прибавили ещё 30г щелочи. Рассчитать массовую долю щелочи в полученном растворе. ​

Answer 1

Ответ:

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Объяснение:

Answer 2

Calculation of the Mass Fraction of Alkali in the Solution

To calculate the mass fraction of alkali in the solution, we need to consider the initial mass of the solution and the additional mass of alkali added.

Given: - Initial mass of the solution: 200 g - Percentage of alkali in the initial solution: 20% - Additional mass of alkali added: 30 g

To calculate the mass fraction of alkali in the final solution, we can use the following formula:

Mass Fraction of Alkali = (Mass of Alkali / Total Mass of Solution) * 100

Let's calculate the mass fraction of alkali in the final solution step by step:

1. Calculate the mass of alkali in the initial solution: - Mass of alkali in the initial solution = (Percentage of alkali / 100) * Initial mass of the solution - Mass of alkali in the initial solution = (20 / 100) * 200 g - Mass of alkali in the initial solution = 40 g

2. Calculate the total mass of the final solution: - Total mass of the final solution = Initial mass of the solution + Additional mass of alkali added - Total mass of the final solution = 200 g + 30 g - Total mass of the final solution = 230 g

3. Calculate the mass fraction of alkali in the final solution: - Mass fraction of alkali = (Mass of alkali in the final solution / Total mass of the final solution) * 100 - Mass fraction of alkali = (40 g / 230 g) * 100 - Mass fraction of alkali ≈ 17.39%

Therefore, the mass fraction of alkali in the final solution is approximately 17.39%.