Question

В раствор пищевой соды массой 450 г с концентрацией 8% добавили ещё 10 г соды.Какова концетрация полученного раствора?

Answer 1

Старый раствор

450г раствора -------------------100%

х г соды ----------------------------8%

х = 450 * 8 : 100 = 36(г) -соды в старос растворе

Новый раствор

соды 36 + 10 = 46(г)

раствора 450 + 10 = 460(г)

460 г раствора -------------------100%

46 г соды ----------------------------х%

х = 46 * 100 : 460 = 10%

Ответ: концентрация раствора 10%

Answer 2

Calculation of Concentration

To calculate the concentration of the resulting solution, we need to consider the initial mass of the solution and the additional mass of sodium bicarbonate added.

Given: - Initial mass of the solution (m1) = 450 g - Concentration of the initial solution (c1) = 8% - Additional mass of sodium bicarbonate added (m2) = 10 g

To find the concentration of the resulting solution (c2), we can use the formula:

c2 = (m1 * c1 + m2) / (m1 + m2)

Substituting the given values into the formula, we get:

c2 = (450 g * 8% + 10 g) / (450 g + 10 g)

Now, let's calculate the concentration of the resulting solution.

Calculation:

c2 = (450 g * 8% + 10 g) / (450 g + 10 g)

c2 = (36 g + 10 g) / 460 g

c2 = 46 g / 460 g

c2 = 0.1 or 10%

Therefore, the concentration of the resulting solution is 10%.