Question

A solution of potassium sulfide is mixed with a solution of magnesium bromide. Identify the two possible products.
A. MgBr
B. KS
C. K2S
D. K2Br2
E. MgBr2
F. MgS
G. KBr
Write the formula of the insoluble product from part 1. 8 KBr.

Answer 1

Answer:

G. KBr

F. MgS

MgS is the insoluble product.

Explanation:

When 2 salts as potasium sulfide, K₂S and magnesium bromide, MgBr₂ react, a double replacement reaction occurs where cations (K⁺ and Mg²⁺) exchange places, as follows:

K₂S + MgBr₂ → 2 KBr + MgS

Thus, the two possible products are:

G. KBr

F. MgS

Now, based on solubility rules:

All compounds containing alkali metal ions (As K⁺) are solubles in water. KBr is soluble

And all sulfides except calcium, strontium and barium sulfide are insoluble.

Thus, the insoluble product is:

MgS