Question

1)Na → Х → NaOH 2)SO2 → Х → CaSO3

Answer 1

1) 2Na + H2 = 2NaH
NaH + H2O = NaOH + H2⬆️
2) SO2 + 2NaOH = Na2SO3 + H2O
Na2SO3 + Ca(OH)2 = CaSO3⬇️ + 2NaOH

Answer 2

It seems like you have two chemical reactions and you want to identify the missing reactant (Х) and the products in each reaction. Let's analyze them one by one:

1. Na → Х → NaOH

In this reaction, we start with sodium (Na) as the reactant, but we don't know what Х is. The arrow indicates a chemical reaction, and the product is sodium hydroxide (NaOH).

The missing reactant (Х) must be water (H2O) since when sodium reacts with water, it produces sodium hydroxide and hydrogen gas:

2 Na + 2 H2O → 2 NaOH + H2

2. SO2 → Х → CaSO3

In this reaction, sulfur dioxide (SO2) is the reactant, and we need to determine what Х is. The arrow indicates a chemical reaction, and the product is calcium sulfite (CaSO3).

The missing reactant (Х) must be calcium hydroxide (Ca(OH)2) since when sulfur dioxide reacts with calcium hydroxide, it produces calcium sulfite and water:

SO2 + Ca(OH)2 → CaSO3 + H2O

So, the completed reactions are:

1. 2 Na + 2 H2O → 2 NaOH + H2
2. SO2 + Ca(OH)2 → CaSO3 + H2O