Principles of Instrumental Analysis
Principles of Instrumental Analysis
7th Edition
ISBN: 9781305577213
Author: Douglas A. Skoog, F. James Holler, Stanley R. Crouch
Publisher: Cengage Learning
Question
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Chapter 2, Problem 2.14QAP
Interpretation Introduction

(a)

Interpretation:

The time it would take to discharge a 0.025 µF capacitor to 1% of its full charge through a resistance of 10 Mχ should be calculated.

Concept introduction:

The product of RC is referred to as time constant for the circuitand is a measure of the time required for a capacitor to chargeor discharge.

Capacitor is discharged to 1% of its full charge. Therefore, the value of charge at time ‘t’ can be related to the initial charge by following equation.

θt=1100×θ0

θt = charge after discharge of the capacitor

θ0 = initial charge of the capacitor

Time taken for the discharge of the capacitor can be calculated using following relationship;

θt=θ0 et/RC

Interpretation Introduction

(b)

Interpretation:

The time it would take to discharge a 0.025 µF capacitor to 1% of its full charge through a resistance of 1 Mχ should be calculated.

Concept introduction:

The product of RC is referred to as time constant for the circuit and is a measure of the time required for a capacitor to charge or discharge.

Capacitor is discharged to 1% of its full charge. Therefore, the value of charge at time ‘t’ can be related to the initial charge by following equation.

θt=1100×θ0

θt = charge after discharge of the capacitor

θ0 = initial charge of the capacitor

Time taken for the discharge of the capacitor can be calculated using following relationship;

θt=θ0 et/RC

Interpretation Introduction

(c)

Interpretation:

The time it would take to discharge a 0.025 µF capacitor to 1% of its full charge through a resistance of 1 kχ should be calculated.

Concept introduction:

The product of RC is referred to as time constant for the circuit and is a measure of the time required for a capacitor to charge or discharge.

Capacitor is discharged to 1% of its full charge. Therefore, the value of charge at time ‘t’ can be related to the initial charge by following equation.

θt=1100×θ0

θt = charge after discharge of the capacitor

θ0 = initial charge of the capacitor

Time taken for the discharge of the capacitor can be calculated using following relationship;

θt=θ0 et/RC

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