Write the balanced chemical equations describing the...

Write the balanced chemical equations describing the dissolving of the following solids in water. Write the expression for $K_{\mathrm{sp}}$ for each process. $$ \begin{array}{ll}{\text { a. } \operatorname{PbBr}_{2}(s)} & {\text { c. } \operatorname{PbCO}_{3}(s)} \\ {\text { b. } \operatorname{Ag}_{2} S(s)} & {\text { d. } \operatorname{Sr}_{3}\left(\mathrm{PO}_{4}\right)_{2}(s)}\end{array} $$

Write the balanced chemical equations describing the dissolving of the following solids in water. Write the expression for $K_{\mathrm{sp}}$ for each process.
$$
\begin{array}{ll}{\text { a. } \operatorname{PbBr}_{2}(s)} & {\text { c. } \operatorname{PbCO}_{3}(s)} \\ {\text { b. } \operatorname{Ag}_{2} S(s)} & {\text { d. } \operatorname{Sr}_{3}\left(\mathrm{PO}_{4}\right)_{2}(s)}\end{array}
$$

Key Concepts

Solubility Product Constant (Ksp)

The solubility product constant, Ksp, is an equilibrium constant used to describe the saturated solution of a sparingly soluble ionic compound. It quantitatively represents the level at which a solute dissolves in water by establishing an equilibrium between the undissolved solid and its constituent ions in solution. The Ksp is calculated by raising the concentration of each ion to the power of its stoichiometric coefficient in the dissolution reaction.

Dissolution Equilibria

Dissolution equilibria refer to the balance achieved when a sparingly soluble solid dissolves in water until its dissolution rate equals its precipitation rate. This equilibrium involves the interconversion between the solid phase and its ions in solution. Understanding these equilibria is essential to predicting the extent of solubility of ionic compounds in water.

Balanced Chemical Equations

Writing balanced chemical equations is crucial in chemical reactions to ensure the conservation of mass and charge. For dissolution processes, the equation is balanced by showing the dissociation of the solid into its respective constituent ions in accordance with the stoichiometric coefficients, which directly impact the formulation of the Ksp expression.

Stoichiometry of Ionic Dissolution

Stoichiometry in the context of ionic dissolution involves determining the correct proportion of ions produced when a compound dissolves. It lays the foundation for creating an accurate Ksp expression by ensuring each ion's concentration is raised to the power corresponding to its coefficient in the balanced dissolution equation.

Transcript

00:01 In this video, we're going to practice setting up solubility products.

00:12 Okay, so for this first one, for the balanced equation, we've got pb, br2, solid, put in liquid water, and we get dissociation, so we've got pb, and that's a 2 plus.

00:50 Aquas, and then we've got 2br, that's a minus aquas, so that our solubility expression is the concentration of pb, no exponent because there's no coefficient on that one.

01:26 You should probably keep the 2 plus.

01:29 In there.

01:33 And let's try that again.

01:39 Maybe give myself some space 2 plus and then br minus and that one's going to have an exponent on it because of the coefficient.

02:05 The pbbr2, the solid does not figure into the solubility product.

02:11 You can put an sp on this to indicate that it's a solubility product because it's a solid and pure substances don't figure in to equilibrium constants.

02:28 The second one, let's take a look at this one.

02:31 We've got ag2s solid, dissolving it in water, liquid.

02:49 And we get to a g with a plus on that aquius plus sulfur let's change the color on that sulfur i could swear i said change color there we go sulfur to minus again aquis and our solubility product here going to be the concentration of a g plus raised to the second power because of the coefficient.

04:06 And then s2 minus, and we're good to go on that one.

04:21 Let's take a look at the third one.

04:23 This one's a little more complicated.

04:26 So we know that we've got pb c .o3 solid dissolved in liquid water.

05:01 And we're going to get pb2 plus.

05:11 And let's put a parentheses around this one...

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