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Asked Mar 24, 2020
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When 15.0 mL of a 8.40×10-4 M ammonium fluoride solution is combined with 25.0 mL of a 4.22×10-4 M magnesium bromide solution does a precipitate form? (yes or no)

For these conditions the Reaction Quotient, Q, is equal to

When 15.0 mL of a 8.40×10-4 M ammonium fluoride solution is combined with 25.0 mL of a
4.22x10-4 M magnesium bromide solution does a precipitate form?
(yes or no)
For these conditions the Reaction Quotient, Q, is equal to
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When 15.0 mL of a 8.40×10-4 M ammonium fluoride solution is combined with 25.0 mL of a 4.22x10-4 M magnesium bromide solution does a precipitate form? (yes or no) For these conditions the Reaction Quotient, Q, is equal to

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Introduction:

Precipitate formation during reactions can be governed by the solubility product (Ksp) value of that precipitate. When the product of ions concentration of that compound which is called reaction quotient exceeds value of Ksp , compound starts precipitating out as solid insoluble salt.

 

 

Given:

The volume of ammonium fluoride is 15 mL.

Chemistry homework question answer, step 1, image 1

The volume of magnesium bromide is 25 mL.

Chemistry homework question answer, step 1, image 2

Formula and Calculations:

The reaction between ammonium fluoride and magnesium bromide is shown below.

Chemistry homework question answer, step 2, image 1

In the reaction, 2 moles of ammonium fluoride react with 1 mole of magnesium bromide to form magnesium fluoride and ammonium bromide.

The total volume of solution after the mixing of two compounds is (15+25) =40 mL.

Thus, the concentration of reactants after mixing is calculated as follows,

Chemistry homework question answer, step 2, image 2

 

Here,

The volume of reactant before mixing is “V1”.

The volume of solution after mixing is “V2”.

The concentration of reactant before mixing is “M1”.

The concentration of reactant after mixing is “M2”.

 

Substitute the known values for NH4F in equation (I).

Chemistry homework question answer, step 2, image 3

Similarly, substitute the known values for MgBr2 in equation (I).

Chemistry homework question answer, step 2, image 4

Dissociation of magnesium fluoride is shown below.

Chemistry homework question answer, step 2, image 5

Chemistry homework question answer, step 2, image 6

Substitute the values in the formula.

Chemistry homework question answer, step 2, image 7

Chemistry homework question answer, step 2, image 8

As, value of Q less than that of Ksp, precipitation will not occur in the reaction.

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