(a) Interpretation: The simple average mass of the marbles is to be calculated. Concept introduction: The simple average mass is calculated by adding two masses together and divide by 2 . Each element has a definite number of protons in its nucleus. The number of protons present in the atomic nucleus is known as atomic number . The mass number is the sum of total number of protons and neutrons.

Question

Commercial bleach contains either chlorine or oxygen as an active ingredient. A commercial oxygenated bleach is much safer to handle and less likely to ruin your clothes. It is possible to determine the amount of active ingredient in an oxygenated bleach product by performing a redox titration. The balance reaction for such a titration is: 6H+ +5H2O2 +2MnO4- à 5O2 + 2Mn2+ + 8H2O If you performed the following procedure: “First, dilute the Seventh Generation Non-Chlorine Bleach by pipetting 10 mL of bleach in a 100 mL volumetric flask and filling the flask to the mark with distilled water. Next, pipet 10 mL of the diluted bleach solution into a 250 mL Erlenmeyer flask and add 20 mL of 1.0 M H2SO4 to the flask. This solution should be titrated with 0.0100 M KMnO4 solution.” It took 18.47mL of the KMnO4 to reach the endpoint on average. What was the concentration of H2O2 in the original bleach solution in weight % assuming the density of bleach is 1g/mL?

Answer 1

Question

Chapter 4, Problem 3CE

Interpretation Introduction

(a)

Interpretation:

The simple average mass of the marbles is to be calculated.

Concept introduction:

The simple average mass is calculated by adding two masses together and divide by 2. Each element has a definite number of protons in its nucleus. The number of protons present in the atomic nucleus is known as atomic number. The mass number is the sum of total number of protons and neutrons.

Interpretation Introduction

(b)

Interpretation:

The weighted average mass of the marbles is to be calculated

Concept introduction:

The simple average mass is calculated by adding two masses together and divide by 2. Each element has a definite number of protons in its nucleus. The number of protons present in the atomic nucleus is known as atomic number. The mass number is the sum of total number of protons and neutrons.

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Commercial bleach contains either chlorine or oxygen as an active ingredient. A commercial oxygenated bleach is much safer to handle and less likely to ruin your clothes. It is possible to determine the amount of active ingredient in an oxygenated bleach product by performing a redox titration. The balance reaction for such a titration is: 6H+ +5H2O2 +2MnO4- à 5O2 + 2Mn2+ + 8H2O If you performed the following procedure: “First, dilute the Seventh Generation Non-Chlorine Bleach by pipetting 10 mL of bleach in a 100 mL volumetric flask and filling the flask to the mark with distilled water. Next, pipet 10 mL of the diluted bleach solution into a 250 mL Erlenmeyer flask and add 20 mL of 1.0 M H2SO4 to the flask. This solution should be titrated with 0.0100 M KMnO4 solution.” It took 18.47mL of the KMnO4 to reach the endpoint on average. What was the concentration of H2O2 in the original bleach solution in weight % assuming the density of bleach is 1g/mL?

10.

Proper care of pH electrodes: Why can you not store a pH electrode in distilled water? What must you instead store it in? Why?