Question

which of the following compounds is insoluble? a magnesium bromide b aluminum sulfide c lithium carbonate d potassium acetate

Explanation:

Step1: Recall solubility rules

Most bromides are soluble, so magnesium bromide is soluble.

Step2: Consider sulfides

Most sulfides are insoluble except for those of alkali metals and ammonium. Aluminum sulfide is insoluble.

Step3: Analyze carbonates

Most carbonates are insoluble, but lithium carbonate has some solubility in water due to the small - sized lithium ion.

Step4: Examine acetates

All acetates are soluble, so potassium acetate is soluble.

Answer:

B. aluminum sulfide