Question

У воді масою 400 г. розчинили натрій хлорид масою 46,8 г. В отриманий розчин помістили інертні електроди і пропустили постійний електричний струм, зібравши хлор, об'єм якого за н. у. становить 2,24 л. Обчисліть масову частку натрій хлориду в розчині, одержаному після припинення електролізу. ​

Answer 1

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Answer 2

To calculate the mass fraction of sodium chloride in the solution obtained after electrolysis, we need to consider the initial mass of sodium chloride and the volume of chlorine gas collected.

Given: - Mass of water = 400 g - Mass of sodium chloride = 46.8 g - Volume of chlorine gas collected = 2.24 L

To find the mass fraction of sodium chloride, we can use the formula:

Mass fraction = (mass of solute / mass of solution) x 100%

Step 1: Calculate the mass of the solution

The mass of the solution is the sum of the mass of water and the mass of sodium chloride:

Mass of solution = Mass of water + Mass of sodium chloride

Step 2: Calculate the mass fraction of sodium chloride

Using the formula mentioned above, we can calculate the mass fraction of sodium chloride in the solution:

Mass fraction = (Mass of sodium chloride / Mass of solution) x 100%

Let's calculate the values:

Step 1: Mass of solution = Mass of water + Mass of sodium chloride Mass of solution = 400 g + 46.8 g Mass of solution = 446.8 g

Step 2: Mass fraction = (Mass of sodium chloride / Mass of solution) x 100% Mass fraction = (46.8 g / 446.8 g) x 100% Mass fraction ≈ 10.48%

Therefore, the mass fraction of sodium chloride in the solution obtained after electrolysis is approximately 10.48%.

Please note that the calculation assumes that there are no other substances present in the solution that could affect the mass fraction of sodium chloride.