
Concept explainers
You mix 25.0 mL of 0.234-M FeCl3 solution with 42.5 mL of 0.453-M NaOH.
- (a) Calculate the maximum mass, in grams, of Fe(OH)3 that will precipitate.
- (b) Determine which reactant is in excess.
- (c) Calculate the concentration of the excess reactant remaining in solution after the maximum mass of Fe(OH)3 has precipitated.
(a)

Interpretation:
The maximum mass in grams of
Concept introduction:
Limiting reagent:
A limiting reactant is a reactant that is completely converted to products. Once all the limiting reactant is converted to products there is no other reactant to react.
Number of moles can be calculated by using following formula,
Explanation of Solution
The reaction is shown below,
Mixing of
According to the balanced equation, 1 moles of
Moles of
According to the mole calculation,
Molar Mass
The mass in grams of
The mass in grams of
(b)

Interpretation:
The excess reactant has to be identified.
Concept introduction:
Refer to part (a)
Explanation of Solution
The reaction is shown below,
Mixing of
According to the balanced equation, 1 moles of
Moles of
According to the mole calculation,
(c)

Interpretation:
The concentration of excess reactant remaining in solution after the precipitation of
Concept introduction:
The Molarity of the solution can be calculated by using following formula
Explanation of Solution
Expected not formed
Expected not formed
Unreacted mole of sodium hydroxide is calculated as follows,
Total volume =
Molarity of the sodium hydroxide solution is calculated as follows,
The concentration of excess reactant is
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Chapter 3 Solutions
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