The solubility of arsenic sulphide is x mole/litre. The Ksp of arsenic sulphide is:
a)4x^3
b)27x^4
c)36x^5
d)108x^5

I need someone to explain the solution. what i get is 4x^3 but the answer is 108x^5

Question

The solubility of arsenic sulphide is x mole/litre. The Ksp of arsenic sulphide is:
a)4x^3
b)27x^4
c)36x^5
d)108x^5

I need someone to explain the solution. what i get is 4x^3 but the answer is 108x^5

ujjwal · Answer

I found my mistake. I was writing wrong formula for Arsenic Sulfide. just got to know, its As2S3... And i got the correct answer.. :)

But i always find it difficult remembering those formulas.. I get confused between Sulfide, sulfite, sulfate and many similar terms.. Also in nitrites, nitrates and all.. Can you suggest me some ways to remember them?

vincent-lyon.fr · Answer

-ide is ALWAYS monatomic anion:

oxide O2- sulfide S2-
fluoride F- chloride Cl-  Bromide Br- iodide I-

per...ate has more oxygen than -ate, has more oxygen than -ite

vincent-lyon.fr · Answer

... and -ite has more oxygen that hypo...ite.