Question

ПОМОГИТЕ ПРОШУ!!!! у трьох пробірках без написів містяться розчини натрій ортофосфату, ферум (||) сульфату і цинк сульфату. визначте за допомогою якісних реакцій кожну з цих речовин.

Answer 1

Ответ:

Объяснение:

В каждую пробирку добавить раствор сульфида натрия:

в пробирке с ортофосфатом натрия изменений не наблюдается;

в пробирке с сульфатом железа (II) образуется черный осадок

FeSO₄ + Na₂S = FeS↓ + Na₂SO₄;

в пробирке с сульфатом цинка образуется белый осадок

ZnSO₄ + Na₂S = ZnS↓ + Na₂SO₄

Answer 2

Identification of Substances in the Test Tubes

To identify the substances in the three test tubes without labels, we can perform qualitative reactions for each of the substances. Here's how we can determine the identity of each substance:

1. Sodium Orthophosphate Solution: To identify the presence of sodium orthophosphate, we can perform a precipitation reaction using silver nitrate solution (AgNO3). If a white precipitate forms, it indicates the presence of phosphate ions, confirming the presence of sodium orthophosphate.

2. Iron(II) Sulfate Solution: To identify the presence of iron(II) sulfate, we can perform a color change reaction using potassium ferricyanide solution (K3Fe(CN)6). If a deep blue color develops, it indicates the presence of iron(II) ions, confirming the presence of iron(II) sulfate.

3. Zinc Sulfate Solution: To identify the presence of zinc sulfate, we can perform a precipitation reaction using sodium hydroxide solution (NaOH). If a white precipitate forms, it indicates the presence of zinc ions, confirming the presence of zinc sulfate.

By performing these qualitative reactions, we can determine the identity of each substance in the test tubes without labels.