Question

Give the conjugate base for each compound below.? Acid --- Conjugate Base H2S _________ HPO4^-2 _________ NH4+ _________ Update: Give the conjugate acid for each compound below? Base ---- Conjugate Acid HSO4- _______ SO4^-2 _______ NH3 _______

Answer 1

 take away one proton from the acid to give its conjugate base. So 

HS- 

PO4^3- 

NH3

Answer 2

According to  Bronsted-Lowry theory acid are donor of protons and bases are acceptors of protons (the hydrogen cation or H⁺).

When acid lost proton, it forms conjugate base and when base gain proton it form conjugate acid.

1) Answer is: HS⁻.

Chemical reaction (dissotiation) : H₂S(aq) → HS⁻(aq) + H⁺(aq).

2) Answer is: PO₄³⁻.

Chemical reaction (dissotiation) : HPO₄²⁻(aq) → PO₄³⁻(aq) + H⁺(aq).

3) Answer is: NH₃.

Chemical reaction (dissotiation) : NH₄⁺(aq) → NH₃(aq) + H⁺(aq).

4) Answer is: H₂SO₄.

Chemical reaction: HSO₄⁻(aq) + H⁺(aq) → H₂SO₄(aq).

5) Answer is: HSO₄⁻.

Chemical reaction: SO₄²⁻(aq) + H⁺(aq) → HSO₄⁻(aq).

6) Answer is: NH₄⁺.

Chemical reaction: NH₃(aq) + H⁺(aq) → NH₄⁺(aq).