Question

Помогите, пожалуйста, с химией! Для полоскания горла применяют 0,2% раствор перманганата калия (марганцовки). Сколько воды и соли нужно взять для приготовления 0,8 кг такого раствора?​

Answer 1

Ответ:

798,4/1,6 (в граммах)

Объяснение:

m(KMnO4)=800*(0.2/100)=1,6 грамма

m(H2O)=800-1.6=798,4 грамма

Answer 2

Preparation of 0.2% Potassium Permanganate Solution

To prepare a 0.2% solution of potassium permanganate (manganese) for gargling, you would need to calculate the amount of water and salt required for the given quantity of the solution.

Given: - Quantity of 0.2% potassium permanganate solution needed: 0.8 kg

Calculation

To calculate the amount of water and salt needed, we can use the following formula:

Amount of solute (in this case, potassium permanganate) = Concentration of solution × Volume of solution

1. Amount of Potassium Permanganate (Solute): - Concentration of the solution: 0.2% - Volume of the solution: 0.8 kg

2. Amount of Water: - The amount of water needed to make the solution can be calculated by subtracting the amount of solute from the total volume of the solution.

3. Amount of Salt: - As per the provided sources, no salt is required for the preparation of the potassium permanganate solution.

Conclusion

To prepare a 0.2% potassium permanganate solution for gargling, you would need to use the calculated amount of water and potassium permanganate without the addition of salt.

I hope this helps! If you have further questions or need additional assistance, feel free to ask.