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Solved: Hard water often contains dissolved Ca2+ and Mg2+

Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro ISBN: 9780321910295 34

Solution for problem 103P Chapter 7

Introductory Chemistry | 5th Edition

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Introductory Chemistry | 5th Edition | ISBN: 9780321910295 | Authors: Nivaldo J Tro

Introductory Chemistry | 5th Edition

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Problem 103P

PROBLEM 103P

Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms insoluble precipitates with calcium and magnesium ions, removing them from solution. Suppose that a solution contains aqueous calcium chloride and aqueous magnesium nitrate. Write molecular, complete ionic, and net ionic equations showing how the addition of sodium phosphate precipitates the calcium and magnesium ions.

Step-by-Step Solution:

Solution 103P

Step 1:

Let’s consider calcium chloride and sodium phosphate :

The basic equation :

CaCl2(aq) + Na3PO4 (aq) → Ca3(PO4)2 (s) + NaCl(aq)

The balanced molecular equation is :

        3CaCl2(aq) + 2 Na3PO4 (aq) → Ca3(PO4)2 (aq) + 6NaCl(aq)

The complete ionic equation :

3Ca2+(aq) + 6 Cl-(aq) + 6 Na+(aq) + 2PO43- (aq)   →   Ca3(PO4)2 (s) + 6 Na+ (aq) + 6 Cl- (aq)

The net ionic equation :

        To write net ionic equation, we cancel out the ions that is on both the sides, which are spectator ions.

And the net ionic equation is as follows :

        3 Ca2+(aq)  +  2PO43- (aq)   →   Ca3(PO4)2 (s)

Step 2 of 2

Chapter 7, Problem 103P is Solved
Textbook: Introductory Chemistry
Edition: 5
Author: Nivaldo J Tro
ISBN: 9780321910295

Introductory Chemistry was written by and is associated to the ISBN: 9780321910295. The full step-by-step solution to problem: 103P from chapter: 7 was answered by , our top Chemistry solution expert on 05/06/17, 06:45PM. This textbook survival guide was created for the textbook: Introductory Chemistry, edition: 5. The answer to “Hard water often contains dissolved Ca2+ and Mg2+ ions. One way to soften water is to add phosphates. The phosphate ion forms insoluble precipitates with calcium and magnesium ions, removing them from solution. Suppose that a solution contains aqueous calcium chloride and aqueous magnesium nitrate. Write molecular, complete ionic, and net ionic equations showing how the addition of sodium phosphate precipitates the calcium and magnesium ions.” is broken down into a number of easy to follow steps, and 66 words. This full solution covers the following key subjects: Calcium, ions, magnesium, Phosphate, precipitates. This expansive textbook survival guide covers 19 chapters, and 2045 solutions. Since the solution to 103P from 7 chapter was answered, more than 2811 students have viewed the full step-by-step answer.

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