Question

classify each ionic compound as insoluble or soluble in water. select the single best answer for each part. note: reference the general solubility rules for ionic compounds in water table for additional information. part 1 of 4 na₂so₄ ∘ soluble ∘ insoluble part 2 of 4 agbr ∘ soluble ∘ insoluble

Explanation:

Part 1: $\boldsymbol{\ce{Na2SO4}}$

Step 1: Recall solubility rules for sodium salts

Sodium ($\ce{Na+}$) is an alkali metal cation. According to the general solubility rules, all salts of alkali metals (Group 1 elements) are soluble in water.

Step 2: Apply the rule to $\ce{Na2SO4}$

In $\ce{Na2SO4}$, the cation is $\ce{Na+}$ (an alkali metal ion) and the anion is $\ce{SO4^{2-}}$. Since salts of alkali metals are soluble, $\ce{Na2SO4}$ is soluble in water.

Step 1: Recall solubility rules for silver and bromide

Silver ($\ce{Ag+}$) is a cation, and bromide ($\ce{Br-}$) is an anion. The general solubility rule states that most silver salts are insoluble. Specifically, silver bromide ($\ce{AgBr}$) is one of the insoluble silver halides (along with $\ce{AgCl}$, $\ce{AgI}$ etc.).

Step 2: Confirm the solubility of $\ce{AgBr}$

Applying the solubility rule for silver halides, $\ce{AgBr}$ does not dissolve in water, so it is insoluble.

Answer:

soluble

Part 2: $\boldsymbol{\ce{AgBr}}$