Question

В воде массой 25г растворили натрий массой 3 г. Рассчитайте массовую долю гидроксида натрия в полученном растворе

Answer 1

Всего лишь разделить 3г/25г*100%=12% массовая доля

Answer 2

Calculating the Mass Fraction of Sodium Hydroxide in the Solution

To calculate the mass fraction of sodium hydroxide in the solution, we can use the following formula:

Mass Fraction = (Mass of Sodium Hydroxide / Total Mass of Solution) x 100%

Given: - Mass of water = 25g - Mass of sodium = 3g

Using the given masses, we can calculate the mass fraction of sodium hydroxide in the solution.

Mass of Sodium Hydroxide: The mass of sodium hydroxide can be calculated by subtracting the mass of water from the total mass of the solution.

Mass of Sodium Hydroxide = Total Mass of Solution - Mass of Water

Mass of Sodium Hydroxide = 3g

Total Mass of Solution = Mass of Water + Mass of Sodium

Total Mass of Solution = 25g + 3g = 28g

Now, we can calculate the mass fraction of sodium hydroxide in the solution using the formula mentioned above.

Mass Fraction of Sodium Hydroxide = (3g / 28g) x 100%

Mass Fraction of Sodium Hydroxide = 10.71%

Therefore, the mass fraction of sodium hydroxide in the obtained solution is 10.71%.