# How much ferrous sulfide will dissolve in one liter of water if its ksp is 3.7x10^-19?

##### 1 Answer

#### Explanation:

Here's our balanced equation:

From this, we can see that

From the balanced equation, we can also know that the *expression* for

(For more information on how this expression was derived, check out this awesome webpage on ChemTeam!)

The question tells us that the *value* of

The mole ratio of

This is because concentration, here, is measured in moles per liter. They're in the same solution—in other words, the number of liters is the same. Therefore, we can use the mole ratio to relate their concentrations.

So, the expression could be rewritten as:

To solve for

This is the same as