Question

Осуществите превращения: Ca3PO4→ P →H3PO4 → Ca(H2PO4)2→ Ca3(PO4)2 Осуществите превращения: H2S→ S→ SO2→ SO3→ K2SO4 →BaSO4

Answer 1

2Ca3(PO4)2 + 10C + 6SiO2 = 4P + 10CO + 6CaSiO3
3P + 5HNO3 + 2H2O = 3H3PO4 + 5NO
Ca3(PO4)2 + 4H3PO4 = 3Ca(H2PO4)2
Ca(H2PO4)2 + 2Ca(OH)2 = Ca3(PO4)2 + 2H2O


H2S+ I2 = S + 2HI
S + O2 = SO2
2SO2 + O2 = 2SO3
SO3 + 2KOH = K2SO4 + H2O
K2SO4 + Ba(OH)2 = BaSO4 + 2KOH

Answer 2

Transformation: Ca3PO4 → P → H3PO4 → Ca(H2PO4)2 → Ca3(PO4)2

The given transformations involve the conversion of calcium phosphate (Ca3PO4) to calcium phosphate (Ca3(PO4)2) through several intermediate steps. Let's break down each step:

1. Ca3PO4 → P: - Calcium phosphate (Ca3PO4) can be converted to phosphorus (P) through a process called thermal decomposition or calcination. - During calcination, calcium phosphate is heated to a high temperature, causing it to decompose and release phosphorus gas. - The balanced chemical equation for this transformation is: ``` 2 Ca3PO4 → 6 CaO + P4 ```

2. P → H3PO4: - Phosphorus gas (P) can react with oxygen (O2) in the air to form phosphorus pentoxide (P2O5). - Phosphorus pentoxide can then react with water (H2O) to form phosphoric acid (H3PO4). - The balanced chemical equations for these transformations are: ``` P4 + 5 O2 → 2 P2O5 P2O5 + 3 H2O → 2 H3PO4 ```

3. H3PO4 → Ca(H2PO4)2: - Phosphoric acid (H3PO4) can react with calcium hydroxide (Ca(OH)2) to form calcium dihydrogen phosphate (Ca(H2PO4)2). - The balanced chemical equation for this transformation is: ``` 2 H3PO4 + 3 Ca(OH)2 → Ca(H2PO4)2 + 6 H2O ```

4. Ca(H2PO4)2 → Ca3(PO4)2: - Calcium dihydrogen phosphate (Ca(H2PO4)2) can undergo a dehydration reaction to form calcium phosphate (Ca3(PO4)2). - The balanced chemical equation for this transformation is: ``` Ca(H2PO4)2 → Ca3(PO4)2 + 2 H2O ```

Therefore, the complete transformation from Ca3PO4 to Ca3(PO4)2 involves the following steps: Ca3PO4 → P → H3PO4 → Ca(H2PO4)2 → Ca3(PO4)2.

Transformation: H2S → S → SO2 → SO3 → K2SO4 → BaSO4

The given transformations involve the conversion of hydrogen sulfide (H2S) to barium sulfate (BaSO4) through several intermediate steps. Let's break down each step:

1. H2S → S: - Hydrogen sulfide (H2S) can be oxidized to elemental sulfur (S) through a process called combustion. - When hydrogen sulfide reacts with oxygen (O2), it forms sulfur dioxide (SO2) and water (H2O). - The balanced chemical equation for this transformation is: ``` 2 H2S + 3 O2 → 2 SO2 + 2 H2O ```

2. S → SO2: - Elemental sulfur (S) can react with oxygen (O2) to form sulfur dioxide (SO2). - The balanced chemical equation for this transformation is: ``` S + O2 → SO2 ```

3. SO2 → SO3: - Sulfur dioxide (SO2) can be further oxidized to sulfur trioxide (SO3) through a process called catalytic oxidation. - This reaction is typically carried out in the presence of a catalyst, such as vanadium pentoxide (V2O5). - The balanced chemical equation for this transformation is: ``` 2 SO2 + O2 → 2 SO3 ```

4. SO3 → K2SO4: - Sulfur trioxide (SO3) can react with potassium hydroxide (KOH) to form potassium sulfate (K2SO4). - The balanced chemical equation for this transformation is: ``` SO3 + 2 KOH → K2SO4 + H2O ```

5. K2SO4 → BaSO4: - Potassium sulfate (K2SO4) can react with barium chloride (BaCl2) to form barium sulfate (BaSO4) through a precipitation reaction. - The balanced chemical equation for this transformation is: ``` BaCl2 + K2SO4 → BaSO4 + 2 KCl ```

Therefore, the complete transformation from H2S to BaSO4 involves the following steps: H2S → S → SO2 → SO3 → K2SO4 → BaSO4.