Question

1. classify each of the substances as being soluble or insoluble in water.

a. kbr
b. pbco3
c. zinc hydroxide
d. sodium acetate
e. silver iodide
f. zinc carbonate
g. silver acetate
h. copper (ii) sulfide
i. mg3(po4)2
j. koh
k. nh4oh
l. hg2so4
m. pbi2

Explanation:

Use standard solubility rules:

1. Salts of group 1 metals (Na⁺, K⁺, NH₄⁺) are soluble.
2. Acetates are mostly soluble (silver acetate is slightly soluble, classified as insoluble here per standard rules).
3. Carbonates, hydroxides (except group 1, NH₄⁺), sulfides (except group 1, 2, NH₄⁺), phosphates, and most silver/lead halides are insoluble.
4. Halides are soluble except Ag⁺, Pb²⁺, Hg₂²⁺.
5. Sulfates are soluble except Pb²⁺, Ba²⁺, Hg₂²⁺, Ca²⁺.

Answer:

a. KBr: Soluble (S)
b. PbCO₃: Insoluble (I)
c. zinc hydroxide: Insoluble (I)
d. sodium acetate: Soluble (S)
e. silver iodide: Insoluble (I)
f. zinc carbonate: Insoluble (I)
g. silver acetate: Insoluble (I)
h. copper (II) sulfide: Insoluble (I)
i. Mg₃(PO₄)₂: Insoluble (I)
j. KOH: Soluble (S)
k. NH₄OH: Soluble (S)
l. Hg₂SO₄: Insoluble (I)
m. PbI₂: Insoluble (I)