Solution Manual for Quantitative Chemical Analysis
Solution Manual for Quantitative Chemical Analysis
9th Edition
ISBN: 9781464175633
Author: Daniel Harris
Publisher: Palgrave Macmillan Higher Ed
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Chapter 7, Problem 7.AE

(a)

Interpretation Introduction

Interpretation:

The formula mass of ascorbic acid has to be calculated.

Concept introduction:

Formula mass is defined as addition of atomic mass of atoms of the compound in empirical formula.  The unit is atomic mass unit(amu)

(a)

Expert Solution
Check Mark

Answer to Problem 7.AE

The formula mass of ascorbic acid is 176.124g/mol .

Explanation of Solution

To calculate: The formula mass of ascorbic acid.

Solution Manual for Quantitative Chemical Analysis, Chapter 7, Problem 7.AE

The molecular formula of ascorbic acid is C6H8O6

The formula mass is determined as follows,

=6(atomic mass of C) + 8(atomic mass of H)+ 6(atomic mass of 0) = 6( 12.010 6) + 8(1.007 98) + 6(15.999 4)=176.124g/mol

(b)

Interpretation Introduction

Interpretation:

The molarity of I3- solution has to be calculated.

Concept introduction:

Molarity can be defined as the moles of solute (in grams) to the volume of the solution (in litres). The molarity of a solution can be given by the formula,

Molarity(M)=Molesofsolute(inmol)Volumeofsolution(inL)

(b)

Expert Solution
Check Mark

Answer to Problem 7.AE

The molarity of I3- solution is 0.038 03 M .

Explanation of Solution

To calculate: The molarity of I3- solution.

The molecular weight of ascorbic acid is 176.124g/mol .

The number of moles of ascorbic acid is calculated as

Mole=GivenweightMolecularweight=0.1970 g176.124 g/mol=1.118 5 mmol

There are equal number of moles for both ascorbic acid and I3- .  Thus, the molarity is calculated as

Molarity ofI3- = 1.118 5 mmol/29.41 mL= 0.03803 M

(c)

Interpretation Introduction

Interpretation:

The mass percentage of ascorbic acid in given tablet has to be calculated.

Concept introduction:

The mass percentage of compound can be calculated by taking the calculated mass of the substance to the total mass of the sample whole multiplied by 100.

The mass percent can be calculated with formula,

Masspercent(inpercentage)=Calculatedmass(ingrams)totalmass(ingrams)×100

Molarmass=MassMole

Molarity can be defined as the moles of solute (in grams) to the volume of the solution (in litres). The molarity of a solution can be given by the formula,

Molarity(M)=Molesofsolute(inmol)Volumeofsolution(inL)

(c)

Expert Solution
Check Mark

Answer to Problem 7.AE

The mass percentage of ascorbic acid in given tablet is 49.94% .

Explanation of Solution

To calculate: The mass percentage of ascorbic acid in given tablet.

The number of moles of  I3- is calculated as

=0.03803(mol/L)×0.03163L=0.001203mol

There are equal number of moles for both ascorbic acid and I3- .

Moles=0.001203molofascorbicacid

The mass of ascorbic acid is derived from molecular weight of ascorbic acid

=176.124g/mol×0.001203mol=0.2119g

The mass percent of ascorbic acid in given tablet is

Masspercent=0.2119g0.4242g×100=49.94%ofascorbicacidintablet

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