Question

У трьох пронумерованих пробірках містяться розчини натрій карбонату , калій хлориду , калій сульфату. Визначте у якій пробірці міститься кожний із них.

Answer 1

1.Для начала добавим раствор HCl соляную кислоту в пробирке, где карбонат выделится газ  Na2CO3+2HCl=2NaCl+H2O+CO2↑
2. затем добавим хлорид бария раствор  К2SO4+BaCl2=BaSO4↓+2KCl выпадет белый осадок
3.в заключении в последнюю пробирку добавим раствор AgNO3
KCl+AgNO3=AgCl↓+KNO3 выпадет творожистый белый осадок.

Answer 2

Identification of Solutions in Numbered Test Tubes

To determine which solution is present in each numbered test tube, we need to analyze the given information. According to the question, there are three numbered test tubes containing solutions of sodium carbonate, potassium chloride, and potassium sulfate.

Unfortunately, the search results provided by You.com do not contain any relevant information to directly answer this question. However, we can still provide a logical approach to solving this problem.

To identify the solutions in the numbered test tubes, we can use chemical reactions and observations. Here's a step-by-step process to determine the contents of each test tube:

1. Sodium Carbonate Solution: Sodium carbonate is a basic compound that reacts with acids to produce carbon dioxide gas. To test for the presence of sodium carbonate, we can add a few drops of dilute hydrochloric acid (HCl) to each test tube. If the solution in a test tube fizzes and releases bubbles of carbon dioxide gas, it indicates the presence of sodium carbonate.

2. Potassium Chloride Solution: Potassium chloride is a neutral compound that does not react significantly with acids or bases. To identify the presence of potassium chloride, we can perform a flame test. We can take a small amount of the solution from each test tube and place it on a clean flame-resistant surface. Then, using a flame source (such as a Bunsen burner), we can observe the color of the flame produced. Potassium compounds, including potassium chloride, typically produce a lilac or violet flame color.

3. Potassium Sulfate Solution: Potassium sulfate is a neutral compound that does not exhibit any specific reactions or color changes. To identify the presence of potassium sulfate, we can perform a precipitation reaction. We can add a few drops of a solution of barium chloride (BaCl2) to each test tube. If a white precipitate (barium sulfate) forms, it indicates the presence of sulfate ions, confirming the presence of potassium sulfate.

By following these steps, we can determine the contents of each numbered test tube based on the observed reactions and color changes. It is important to note that these methods are general and may vary depending on the specific concentrations and conditions of the solutions.

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