   # Some potassium dichromate (K 2 Cr 2 O 7 ), 2.335 g, is dissolved in enough water to make exactly 500. mL of solution. What is the molar concentration of the potassium dichromate? What are the molar concentrations of the k + and Cr 2 O 7 2– ions? ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640

#### Solutions

Chapter
Section ### Chemistry & Chemical Reactivity

9th Edition
John C. Kotz + 3 others
Publisher: Cengage Learning
ISBN: 9781133949640
Chapter 4, Problem 40PS
Textbook Problem
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## Some potassium dichromate (K2Cr2O7), 2.335 g, is dissolved in enough water to make exactly 500. mL of solution. What is the molar concentration of the potassium dichromate? What are the molar concentrations of the k+ and Cr2O72– ions?

Interpretation Introduction

Interpretation:

The molar concentration of K2Cr2O7K+andCr2O72- ions should be determined.

Concept introduction:

• Concentration of solutions can be expressed in various terms; molarity is one such concentration expressing term.
• Molarity (M) of a solution is the number of gram moles of a solute present in one litre of the solution.

Molarity=MassperlitreMolecular mass

• A solution containing one gram mole or  0.1 gram of solute per litre of solution is called molar solution.
• Amount of substance (mol) can be determined by using the equation,

Numberofmole=GivenmassofthesubstanceMolarmass

• The molar mass of an element or compound is the mass in grams of 1 mole of that substance, and it is expressed in the unit of grams per mol (g/mol).
• For chemical reaction balanced chemical reaction equation written in accordance with the Law of conservation of mass.
• Law of conservation of mass states that for a reaction total mass of the reactant and product must be equal.

### Explanation of Solution

Amount of K2Cr2O7 (in mol) can be calculated as follows,

2.335gK2Cr2O7×1molofK2Cr2O7294.185gK2Cr2O7=0.00793molK2Cr2O7

From the above calculated value it is possible to find the concentration of K2Cr2O7.

ConcentrationofK2Cr2O7=0.00793 molK2Cr2O70.500L=0

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