Question

# Is Ag${_2}$SO${_4}$ soluble or insoluble in water?

Solution

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When we talk about a water solubility, it represents the maximum amount of a substance which can be dissolved in some volume of a water solution at a given temperature and pressure. Solubility can be expressed as a mass of dissolved substance (in grams) per 100 g of a solution or as a mass of dissolved substance (in grams) per 1 L of a solution.

$\mathrm{\dfrac{g}{100\ g}\ or\ \dfrac{g}{1\ L}}$

There are some rules to which we can refer when determining if some substance is soluble in water or not:

• metals from group I are soluble

• compounds which contain ammonium ion (NH${_4^+}$) are soluble

• compounds which contain nitrates are soluble

• compounds which contain chlorides are soluble (except silver chloride and lead chloride)

• compounds which contain sulfates are soluble (except lead sulfate, barium sulfate, silver sulfate and calcium sulfate)

• compounds which contain carbonates and hydroxides are insoluble (except compounds which contain sodium, potassium and NH${_4^+}$)

In our case we have silver sulfate (Ag${_2}$SO${_4}$). In the rules above, we mentioned that sulfates are soluble in water with several exceptions among which is silver sulfate, thus, we can conclude that Ag${_2}$SO${_4}$ is insoluble in water.