Quantitative Chemical Analysis 9e And Sapling Advanced Single Course For Analytical Chemistry (access Card)
Quantitative Chemical Analysis 9e And Sapling Advanced Single Course For Analytical Chemistry (access Card)
9th Edition
ISBN: 9781319090241
Author: Daniel C. Harris, Sapling Learning
Publisher: W. H. Freeman
Question
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Chapter 3, Problem 3.20P

(a)

Interpretation Introduction

Interpretation:

The formula mass and its uncertainty for Na2CO3 has to be found out.

Concept Introduction:

Uncertainty:

Uncertainty means state of not certain in predicting a value.  In a measured value, the last digit will have associated uncertainty. Uncertainty has two values, absolute uncertainty and relative uncertainty.

Absolute uncertainty:

Expressed the marginal value associated with a measurement

Relative uncertainty:

Compares the size of absolute uncertainty with the size of its associated measurement

Relative uncertainty = absolute uncertaintymagnitude of measurement

To Find: The formula mass and its uncertainty for Na2CO3

(b)

Interpretation Introduction

Interpretation:

The molarity of HCl and its absolute uncertainty has to be found out.

Concept Introduction:

Uncertainty:

Uncertainty means state of not certain in predicting a value.  In a measured value, the last digit will have associated uncertainty. Uncertainty has two values, absolute uncertainty and relative uncertainty.

Absolute uncertainty:

Expressed the marginal value associated with a measurement

Relative uncertainty:

Compares the size of absolute uncertainty with the size of its associated measurement

Relative uncertainty = absolute uncertaintymagnitude of measurement

Molarity:

Molarity = No. of molesLiter

To Find: The molarity of HCl and its absolute uncertainty

(c)

Interpretation Introduction

Interpretation:

When the purity of Na2CO3 is considered as (100.00±0.05)% , the molarity of HCl and its absolute uncertainty has to be recalculated from part (b).

Concept Introduction:

Uncertainty:

Uncertainty means state of not certain in predicting a value.  In a measured value, the last digit will have associated uncertainty. Uncertainty has two values, absolute uncertainty and relative uncertainty.

Absolute uncertainty:

Expressed the marginal value associated with a measurement

Relative uncertainty:

Compares the size of absolute uncertainty with the size of its associated measurement

Relative uncertainty = absolute uncertaintymagnitude of measurement

Molarity:

Molarity = No. of molesLiter

To Calculate: The molarity of HCl and its absolute uncertainty when the purity of Na2CO3 is considered as (100.00±0.05)% .

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