Chapter 8: Q4P (page 183)

Calculate the ionic strength of (a) 0.008 7 M KOH and (b) 0.000 2 $M - La {({IO}_{3})}_{3}$ (assuming complete disassociation at this low concentration and no hydrolysis reaction to make ${LaOH}^{2 +}$ ).

Short Answer

Expert verified

The ionic strength for 0.008 7 M KOH is 0.0087M and for

0.000 2 $M - La {({IO}_{3})}_{3}$ is 0.0012M

Step by step solution

Step 1:Finding the ionic strength of 0.008 7 M KOH

The ionic strength $μ ‐ a$ a concentration of ions in a solution is calculated by using the following formula,

$μ = \frac{1}{2} (c_{1} {z_{1}}^{2} + c_{2} {z_{2}}^{2} + . . .)$

, wherestands for concentration and z stands for charge.

First the ionic strength of 0.008 7 M KOH can be calculated.

The reaction of disassociation would be $KOH ֏ k^{+} + {OH}^{-}$

role="math" localid="1654835701912" $z_{1} = + 1 z_{2} = - 1 μ = \frac{1}{2} (0.0087 \times {(+ 1)}^{2} + 0.0087 \times {(- 1)}^{2}) - 0.0087 M$

Finding the ionic strength of 0.000 2 M- La(IO3)3

Next, for 0.000 2 $M - La {({IO}_{3})}_{3}$ , in this case both ions have different concentration.

$La {({IO}_{3})}_{3} + H_{3} O֏ La {(OH)}^{2} + 3 {IO}_{3} + H^{+} μ = \frac{1}{2} (0.0002 \times {(+ 3)}^{2} + 0.0006 \times {(- 1)}^{2}) = 0.0012 M$

Thus, the ionic strength for 0.008 7 M KOH is 0.0087M and for $0.000 2 M - La {({IO}_{3})}_{3}$ is 0.0012 M

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Calculate the ionic strength of (a) 0.008 7 M KOH and (b) 0.000 2 $M - La {({IO}_{3})}_{3}$ (assuming complete disassociation at this low concentration and no hydrolysis reaction to make ${LaOH}^{2 +}$ ).

Short Answer

Step by step solution

Step 1:Finding the ionic strength of 0.008 7 M KOH

Finding the ionic strength of 0.000 2 M- La(IO3)3

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Calculate the ionic strength of (a) 0.008 7 M KOH and (b) 0.000 2 M-La(IO3)3(assuming complete disassociation at this low concentration and no hydrolysis reaction to makeLaOH2+ ).

Short Answer

Step by step solution

Step 1:Finding the ionic strength of 0.008 7 M KOH

Finding the ionic strength of 0.000 2 M- La(IO3)3

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

The Earths Atmosphere

Chemistry Branches

Kinetics

Inorganic Chemistry

Chemical Analysis

Making Measurements

Study anywhere. Anytime. Across all devices.

Calculate the ionic strength of (a) 0.008 7 M KOH and (b) 0.000 2 $M - La {({IO}_{3})}_{3}$ (assuming complete disassociation at this low concentration and no hydrolysis reaction to make ${LaOH}^{2 +}$ ).