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Solution Stoichiometry and Chemical Analysis (Section)An

Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward ISBN: 9780321696724 27

Solution for problem 86E Chapter 4

Chemistry: The Central Science | 12th Edition

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Chemistry: The Central Science | 12th Edition | ISBN: 9780321696724 | Authors: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward

Chemistry: The Central Science | 12th Edition

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Problem 86E

Problem 86E

Solution Stoichiometry and Chemical Analysis (Section)

An 8.65-g sample of an unknown group 2A metal hydroxide is dissolved in 85.0 mL of water. An acid–base indicator is added and the resulting solution is titrated with 2.50 M HCl(aq) solution. The indicator changes color signaling that the equivalence point has been reached after 56.9 mL of the hydrochloric acid solution has been added

(a) What is the molar mass of the metal hydroxide?

(b) What is the identity of the metal cation: Ca2+, Sr2+, Ba2+?

Step-by-Step Solution:

Problem 86 E

Solution Stoichiometry and Chemical Analysis (Section)

An 8.65 -g sample of an unknown group 2 A metal hydroxide is dissolved in 85.0 mL of water. An acid-base indicator is added and the resulting solution is titrated with 2.50 M HCl ( aq ) solution. The indicator changes color signaling that the equivalence point has been reached after 56.9 mL of the hydrochloric acid solution has been added

(a) What is the molar mass of the metal hydroxide?

(b) What is the identity of the metal cation:

        

                                                              Step by Step Solution

Step 1 of 2

(a)

From the given,

Mass of unknown group 2A metal hydroxide = 8.65 g

It is dissolved in 85.0 mL of water, so the volume of this solution is 85.0 mL

When this solution is titrated with 2.50 M HCl(aq) solution, equivalence point is reached after

56.9 mL of the HCl(aq) solution is added.

So the moles of HCl required for neutralization is:

Moles of  the hydrogen chloride are calculated by the following formula.

 

           

           

As group 2A metals (group 1A) form di-hydroxides, two moles of HCl is required to neutralize

one mole of hydroxide. Then the number of moles of metal hydroxide neutralized by 0.142 moles of HCl is

                                                     l

The molar mass of metal hydroxide is determined using its mass and moles

 

 

Therefore, the molar mass of metal hydroxide is 122 g/mol .

Step 2 of 2

Chapter 4, Problem 86E is Solved
Textbook: Chemistry: The Central Science
Edition: 12
Author: Theodore E. Brown; H. Eugene LeMay; Bruce E. Bursten; Catherine Murphy; Patrick Woodward
ISBN: 9780321696724

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Solution Stoichiometry and Chemical Analysis (Section)An