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The text in the image contains a set of practical problems related to solution concentrations. Here is a transcription and summary of the tasks:

### Practical Work

1. **Instruction:** For each example from the theoretical material, substitute the values with your own. Write the problem with your values and solve it.

2. **Solve the problems:**

   **a)** How much water is needed to be added to 50 g of sodium chloride to obtain a 20% solution?

   **b)** How much magnesium sulfate and water are required to prepare 300 ml of a 30% solution?

   **c)** How much water is present in 150 ml of a 20% solution?

   **d)** How to prepare 600 ml of a 5% sodium chloride solution?

   **e)** To 80 ml of glycerin, 160 ml of water was added. What is the concentration of the resulting solution?

   **f)** How much substance needs to be added to 50 ml of water to obtain a 10% solution?

   **g)** To 50 ml of a 20% potassium sulfate solution, 450 ml of water was added. What is the percentage concentration of the resulting solution?

   **h)** 3 liters of a 25% aqueous solution of a substance was mixed with 12 liters of a 15% aqueous solution of the same substance. What is the percentage concentration of the resulting solution?

Would you like me to solve these step by step or a specific problem from the list?

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Here are 5 related questions to expand the topic:

1. What formula is used to calculate the concentration of a solution after dilution?
2. How do you prepare a solution with a specific concentration from a more concentrated stock solution?
3. What is the difference between a mass percentage and a volume percentage in solution calculations?
4. How does the density of the solvent affect the preparation of a solution?
5. What are the practical applications of calculating solution concentrations in everyday life?

**Tip:** Always use the formula \( C_1V_1 = C_2V_2 \) when diluting or concentrating solutions to ensure accurate results.

Практическая работа с задачами по концентрации растворов: а) сколько воды нужно добавить к 50 г хлорида натрия, чтобы получить 20% раствор? б) сколько потребуется сульфата магния и воды для приготовления 300 мл 30% раствора? в) сколько воды содержится в 150 мл 20% раствора? г) как приготовить 600 мл 5% раствора хлорида натрия? д) к 80 мл глицерина добавили 160 мл воды. Какова концентрация полученного вещества? е) сколько вещества надо добавить к 50 мл воды, чтобы получить 10% раствор? ж) к 50 мл 20% раствора сульфата калия добавили 450 мл воды. Какова процентная концентрация полученного вещества? з) смешали 3 л 25% водного раствора вещества с 12 литрами 15% водного раствора того же вещества. Какова концентрация получившегося раствора?

Solve various practical problems related to the concentration of solutions, including calculating water needed for a sodium chloride solution, dilution of magnesium sulfate, and mixing glycerin with water. Understand core concepts such as dilution, solution concentration, and percentage calculations. Suitable for Grades 9-11.

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