
Concept explainers
(a)
Interpretation:
The mass of carbon dioxide that would produce when 6.00 g of H3C6H5O7 reacts with 20.0 g of NaHCO3 is to be calculated.
Concept introduction:
The limiting reagent of a reaction is that reactant of the reaction that controls the amount of product formed. The limiting agents limit the amount of product and by adding some more amount of the limiting reagent in the reaction mixture, the amount of product can be increased.

Answer to Problem 74E
The mass of carbon dioxide that would produce when 6.00 g of H3C6H5O7 reacts with 20.0 g of NaHCO3 is 4.12 g.
Explanation of Solution
The reaction between H3C6H5O7 and NaHCO3 is shown below.
H3C6H5O7(aq)+3NaHCO3(aq)→Na3C6H5O7(aq)+3CO2(g)+3H2O(l)
The mass of H3C6H5O7 reacted is 6.00 g.
The mass of NaHCO3 reacted is 20.0 g.
The molar mass of H3C6H5O7 is 192.12 g/mol.
The molar mass of NaHCO3 is 84.01 g/mol.
The molar mass of carbon dioxide is 44.01 g/mol.
The number of moles of a substance is given by the expression shown below.
n=mM…(1)
Where,
• m is the mass of the substance.
• M is the molar mass of the substance.
Substitute the mass and molar mass of H3C6H5O7 in the equation (1).
n=6.00 g192.12 g/mol=0.0312 mol
Therefore, the number of moles of H3C6H5O7 present in the reaction mixture is 0.0312 mol.
Substitute the mass and molar mass of NaHCO3 in the equation (1).
n=20.0 g84.01 g/mol=0.2381 mol
Therefore, the number of moles of NaHCO3 present in the reaction mixture is 0.2381 mol.
One mole of H3C6H5O7 reacts with three moles of NaHCO3. Therefore, the relation between the number of moles of H3C6H5O7 and NaHCO3 is given by the expression shown below.
nH3C6H5O7=nNaHCO33…(2)
Where,
• nNaHCO3 is the number of moles of NaHCO3.
• nH3C6H5O7 is the number of moles of H3C6H5O7.
Substitute the value of nNaHCO3 in the equation (2).
nCO2=0.2381 mol3=0.0794 mol
The required amount of H3C6H5O7 is greater than the available amount of H3C6H5O7. Therefore, H3C6H5O7 is the limiting reagent.
Three moles of carbon dioxide is produced by one mole of H3C6H5O7. Therefore, the relation between the number of moles of carbon dioxide and H3C6H5O7 is given by the expression shown below.
nCO2=3nH3C6H5O7…(3)
Where,
• nCO2 is the number of moles of carbon dioxide.
• nH3C6H5O7 is the number of moles of H3C6H5O7.
Substitute the value of nH3C6H5O7 in the equation (3).
nCO2=(3)(0.0312 mol)=0.0936 mol
Rearrange the equation (1) for the value of m.
m=nM…(4)
Substitute the value of molar mass and the number of moles of carbon dioxide in the equation (4).
m=(0.0936 mol)(44.01 g/mol)=4.12 g
Therefore, the mass of carbon dioxide that would produce when 6.00 g of H3C6H5O7 reacts with 20.0 g of NaHCO3 is 4.12 g.
The mass of carbon dioxide that would produce when 6.00 g of H3C6H5O7 reacts with 20.0 g of NaHCO3 is 4.12 g.
(b)
Interpretation:
The mass of reactant which would remain unreacted in the reaction of 6.00 g of H3C6H5O7 and 20.0 g of NaHCO3 is to be stated.
Concept introduction:
The limiting reagent of a reaction is that reactant of the reaction that controls the amount of product formed. The limiting agents limit the amount of product and by adding some more amount of the limiting reagent in the reaction mixture, the amount of product can be increased.

Answer to Problem 74E
The mass of NaHCO3 present in excess is 12.1367 g.
Explanation of Solution
The reaction between H3C6H5O7 and NaHCO3 is shown below.
H3C6H5O7(aq)+3NaHCO3(aq)→Na3C6H5O7(aq)+3CO2(g)+3H2O(l)
The mass of H3C6H5O7 reacted is 6.00 g.
The mass of NaHCO3 reacted is 20.0 g.
The molar mass of H3C6H5O7 is 192.12 g/mol.
The molar mass of NaHCO3 is 84.01 g/mol.
The molar mass of carbon dioxide is 44.01 g/mol.
The number of moles of H3C6H5O7 present in the reaction mixture is 0.0312 mol.
One mole of H3C6H5O7 reacts with three moles of NaHCO3. Therefore, the relation between the number of moles of H3C6H5O7 and NaHCO3 is given by the expression shown below.
nNaHCO3=3nH3C6H5O7
Where,
• nNaHCO3 is the number of moles of NaHCO3.
• nH3C6H5O7 is the number of moles of H3C6H5O7.
Substitute the value of nH3C6H5O7 in the above equation.
nNaHCO3=(3)(0.0312 mol)=0.0936 mol
The number of moles of NaHCO3 reacted is 0.0936 mol.
The number of moles of a substance is given by the expression shown below.
n=mM…(1)
Where,
• m is the mass of the substance.
• M is the molar mass of the substance.
Rearrange the equation (1) for the value of m.
m=nM…(4)
Substitute the value of molar mass and the number of moles of NaHCO3 in the equation (4).
m=(0.0936 mol)(84.01 g/mol)=7.8633 g
Therefore, the mass of NaHCO3 reacted to produce 4.12 g of carbon dioxide is 7.8633 g.
The excess mass of NaHCO3 is given by the expression as shown below.
mNaHCO3=m1−m2
Where,
• m1 is the initial mass of NaHCO3 present in the reaction mixture.
• m2 is the mass of NaHCO3 reacted in the reaction.
Substitute the value of m1 and m2 in the above equation.
mNaHCO3=20.0 g−7.8633 g=12.1367 g
Therefore, the mass of NaHCO3 present in excess is 12.1367 g.
The mass of NaHCO3 present in excess is 12.1367 g.
(c)
Interpretation:
Whether the name of Na3C6H5O7 can be predicted or not is to be stated.
Concept introduction:
Ionic compounds are those compounds that have the strong electrostatic force of attraction between the oppositely charged ions. Ionic compounds conduct electricity in solution Salts are the ionic compounds that contain an anion part and cation part. Ionic compounds get dissociated into ions when they dissolved in a solution.

Answer to Problem 74E
The name of Na3C6H5O7 can be predicted. The name of Na3C6H5O7 is sodium citrate.
Explanation of Solution
The compound Na3C6H5O7 is salt.
The cation of Na3C6H5O7 is sodium ion (Na+).
The anion of Na3C6H5O7 is the ion formed by citric acid. The name of the ion formed by citric acid is citrated ion (C6H5O73−).
Therefore, the name of Na3C6H5O7 is sodium citrate.
The name of Na3C6H5O7 can be predicted. The name of Na3C6H5O7 is sodium citrate.
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Chapter 10 Solutions
Bundle: Introductory Chemistry: An Active Learning Approach, 6th + OWLv2, 1 term (6 months) Printed Access Card
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