Concept explainers
For each of the following pairs of combinations, indicate which one will produce the greater mass of solid product:
Interpretation:
The combination producing the greater mass of a solid product is to be determined.
Concept Introduction:
In a precipitation reaction, two ionic compounds in solution react to form an insoluble compound called precipitate.
The formation of precipitates can be predicted by using solubility rules. The mass of the precipitate can be determined from the stoichiometry of the reaction.
The number of moles are calculated as follows:
Answer to Problem 92QP
Solution:
(a) The highest mole amount is yielded by the second combination.
(b)The highest mole amount is yielded by the second combination.
(c)No formation of precipitates has taken place.
Explanation of Solution
a)
Combination
Combination
The net ionic equation taking place, in this case, is as follows:
Combination 1:
From the balanced equation, one mole of
First, calculate the moles of
Moles of
Moles of
Now, the moles of
Moles of
Moles of
Combination 2:
First, calculate the moles of
Moles of
Moles of
Now, the moles of
Moles of
Moles of
Therefore, the secondcombination will produce a greater mass of the product according to limiting reactant, and therefore, the highest mass of precipitates is yielded by this combination.
b)
Combination1:
Combination 2:
Combination 1:
The precipitation reaction between
From the balanced equation, one mole of
First, calculate the moles of
Moles of
Moles of
Now, calculate the moles of
Moles of
Here,
Combination 2:
First, calculate the moles of
Moles of
Moles of
Now, calculate the moles of
Moles of
Here,
Therefore, the second combination will produce a greater mass of the product according to limiting reactant, and therefore, the highest mass of precipitates is yielded by this combination.
c)
Combination1:
Combination 2:
The precipitation reaction between silver nitrate and barium acetate is:
In this reaction, barium acetate and silver nitrate reactwith each other. On the basis of solubility guidelines, acetates and nitrates are always soluble in each other. In this reaction, both will solubilize and no precipitation will take place as these both are soluble in each other.
Therefore, no precipitates will be formed.
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