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Solved: How many total moles of ions are released when

Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg ISBN: 9780073511085 71

Solution for problem 13P Chapter 4

Principles of General Chemistry | 2nd Edition

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Principles of General Chemistry | 2nd Edition | ISBN: 9780073511085 | Authors: Martin S. Silberberg

Principles of General Chemistry | 2nd Edition

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Problem 13P Problem 13P

How many total moles of ions are released when each of the following samples dissolves completely in water?

(a) 0.734 mol of Na2HPO4  (b) 3.86 g of CuSO4·5H2O

(c) 8.66 × 1020 formula units of NiCl2

Step-by-Step Solution:

Solution 13P

Here we have to calculate how many total moles of ions are released when each of the following samples dissolves completely in water.

Step 1

(a) 0.734 mol of Na2HPO4 

1st we will write a chemical equation for the dissociation of K3PO4.

Na2HPO4 (s) → 2 Na+ (aq) + HPO4 2 (aq)

From the above reaction it has been found that 3 moles of ions are released when one mole of Na2HPO4 dissolves,so the total number of moles released can be calculated as,

0.734 mol Na2HPO4  3 mol ions / mol Na2HPO4 = 1.47 mol of ions Na+ ions

0.734 moles of HPO42- is also present.

Thus total mole of ion = 1.47 + 0.734 = 2.202 mol

Thus 2.202 moles of ions are released when Na2HPO4 samples dissolves completely in water.

Step 2 of 3

Chapter 4, Problem 13P is Solved
Step 3 of 3

Textbook: Principles of General Chemistry
Edition: 2
Author: Martin S. Silberberg
ISBN: 9780073511085

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Solved: How many total moles of ions are released when