Question

PtCl4.2HCl precipitate zero moles of AgCl with excess AgNO3 .fromthis data, how we can calculate the secondary valency ?
similarly, CoCl34NH3 will give 1 mole of AgCl. How its secondary valency is calculated?

Answer 1

Hey buddy,

● Answer-
PtCl4.2HCl Secondary valency = 6
CoCl34NH3 Secondary valency = 6

● Explanation-
- Secondary valency is nothing but co-ordination number of the complex

- In PtCl4.2HCl, zero moles of AgCl precipitated with AgNO3 which indicates all 6 Cl- ions are present inside the co-ordination sphere.

Structure- [PtCl4(HCl)2]
Thus coordination nunber 6.
Therefore, secondary valency is 6.

- In CoCl3.4NH3, 1 mole of AgCl precipitated with AgNO3 which indicates all 1 Cl- ions is present outside the co-ordination sphere.

Structure - [CoCl2(NH3)4]Cl
Thus coordination nunber 6.
Therefore, secondary valency is 6.

Hope this is helpful...