Question

СРОЧНО!!! До розчину кислоти масою 15 г з масовою часткою розчиненої речовини 2% додали 5 г кислоти. Розрахуйте масову частку речовини в отриманому розчині

Answer 1

Маса розчину після додавання кислоти становить 15 г + 5 г = 20 г.

Маса речовини в розчині після додавання кислоти становить 2% від 20 г, або 0.02 * 20 г = 0.4 г.

Масова частка речовини в отриманому розчині становить 0.4 г / 20 г * 100% = 2%.

Answer 2

Calculation of the Mass Fraction of the Substance in the Solution

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

Given: - Initial mass of the solution = 15 g - Mass fraction of the dissolved substance = 2% - Mass of the added acid = 5 g

To find the mass fraction of the substance in the resulting solution, we can use the following formula:

Mass Fraction = (Mass of the Substance / Total Mass of the Solution) x 100%

Let's calculate the mass fraction of the substance in the resulting solution:

1. Calculate the mass of the substance in the initial solution: - Mass of the substance = Mass fraction x Total mass of the solution - Mass of the substance = 2% x 15 g = 0.02 x 15 g = 0.3 g

2. Calculate the total mass of the resulting solution: - Total mass of the resulting solution = Initial mass of the solution + Mass of the added acid - Total mass of the resulting solution = 15 g + 5 g = 20 g

3. Calculate the mass fraction of the substance in the resulting solution: - Mass fraction = (Mass of the Substance / Total Mass of the Solution) x 100% - Mass fraction = (0.3 g / 20 g) x 100% = 1.5%

Therefore, the mass fraction of the substance in the resulting solution is 1.5%.

Please note that the provided information does not specify the nature of the substance or the acid involved. If you have any specific details or additional requirements, please let me know, and I'll be happy to assist you further.