Chapter 6: Q2TY (page 128)

Find $[{Pb}^{2 +}], {PbI}_{2} (aq),$ and $[{PbI}_{3}^{-}]$ in a saturated solution of ${PbI}_{2} (s)$ with $[I^{-}] = 0.10 M .$

Short Answer

Expert verified

$Theconcentrationof [{Pb}^{2 +}] is 7.9 \times 10^{- 7} M Theconcentrationof [{PbI}_{2 (aq)}] is 1.1 \times 10^{- 5} M Theconcentrationof [{PbI}_{3}] is 6.6 \times 10^{- 6} M$

Step by step solution

Define the solubility product

It is defined as the product of the dissolved ion concentration raised to the power of the stoichiometric coefficient.

$M_{y} X_{z (s)} \overset{K_{sp}}{⇌} M^{z +} (aq) + {zX}^{y -} (aq) K_{sp} = [M^{z +}]^{y} [X^{y -}]^{z}$

The solubility product is very helpful in predicting whether a salt precipitates in a solution.

Find the concentration.

For the reaction:

${PbI}_{2} (s) ⇇ {Pb}^{+ 2} + 2 I^{-} K_{sp} = 7.9 \times 10^{- 9}$

$K_{s p} = [P b^{+ 2}] [I^{-}]^{2}$

$[{Pb}^{2 +}] = K_{sp} / {[I^{-}]}^{2} = (7.9 \times 10^{- 9}) / {(0.10)}^{2} = 7.9 \times 10^{- 7} M$

Find the concentration.

$P b^{2 +} + 2 I^{-} \overset{β_{2}}{⇇} P b I_{2} β_{2} = 1.4 \times 10^{3} [P b I_{2 (a q)}] = β_{2} [P b^{2 +}] [I^{-}]^{2}$

$= 1.1 \times 10^{- 5} M$

Find the concentration.

$P b^{2 +} + 3 I^{-} \overset{β_{3}}{⇇} P b {I_{3}}^{-} β_{3} = 8.3 \times 10^{3}$

Concentration of $P b l_{3}^{-}$

$[{Pbl}_{3}^{-}] = β_{3} [{Pb}^{2 +}] {[l^{-}]}^{3} = 6.6 \times 10^{- 6} M$

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Find $[{Pb}^{2 +}], {PbI}_{2} (aq),$ and $[{PbI}_{3}^{-}]$ in a saturated solution of ${PbI}_{2} (s)$ with $[I^{-}] = 0.10 M .$

Short Answer

Step by step solution

Define the solubility product

Find the concentration.

Find the concentration.

Find the concentration.

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Find [Pb2+],PbI2(aq),and [PbI3-]in a saturated solution of PbI2(s)with [I-]=0.10M.

Short Answer

Step by step solution

Define the solubility product

Find the concentration.

Find the concentration.

Find the concentration.

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Chemistry Branches

Nuclear Chemistry

Making Measurements

The Earths Atmosphere

Inorganic Chemistry

Ionic and Molecular Compounds

Study anywhere. Anytime. Across all devices.

Find $[{Pb}^{2 +}], {PbI}_{2} (aq),$ and $[{PbI}_{3}^{-}]$ in a saturated solution of ${PbI}_{2} (s)$ with $[I^{-}] = 0.10 M .$