Question

Please write all p ost lab answers directly into your lab notebook .

1) Barium sulfate is a very insoluble compound. Please give reasons for compounds like barium sulfate or barium phosphate to be insoluble that relate to ionic charge.

2) Silver iodide is a very insoluble compound. Please give reasons for compounds like silver sulfate or silver chloride to be insoluble that relate to lattice energy versus energy of hydration .

3) Which species is being oxidized and which is being reduced? Which species is the reducing agent? Which species is the oxidizing agent?

Cl 2(aq) + 2 NaBr (aq)  2 NaCl (aq) + Br 2 (aq) ------

F 2(aq) + 2 NaI (aq)  2 NaF (aq) + I 2 (aq)

Answer 1

Question Number 1

Barium sulfate is a insoluble salt. When it is formed it is always in the form Precipitation.

It can be prepared from the salt solutions of Sodium sulphate and barium Chloride

The possible ions are

So Ba²⁺ will attract the SO4^2- and Na⁺ will attract the Cl^-.

After cancelling the Na⁺ and Cl^- on both side we get the net ionic equation which suggest that the formation white precipitae salt of Barium sulphate.

It proves that BaSO₄(salt) is formed when two opposite aqueous ion will be combined with each other and which is insoluble in water and gives white colour precipitate.

This the answer for question number 1