QUANTIT.CHEM..(LL)-W/WEBASSIGN(6 MONTH)
QUANTIT.CHEM..(LL)-W/WEBASSIGN(6 MONTH)
9th Edition
ISBN: 9781319039387
Author: Harris
Publisher: MAC HIGHER
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Question
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Chapter 2, Problem 2.29P

(a)

Interpretation Introduction

Interpretation:

The equation predicts that the time at which 50% of micro pipets remain within specifications is two years should be given.

Concept introduction:

Fraction within specifications:

In the micro pipette specification, the relationship between fraction specifications with time is given by blow equation,

Fraction within specification=e-t(ln2)/tm

Where,

tm is time between failure time to correct time.

(a)

Expert Solution
Check Mark

Answer to Problem 2.29P

Fraction within specifications is e-ln2

Explanation of Solution

To give the equation predicts that the time at which 50% of micro pipets remain within specifications is two years.

Given,

tm=2Yr

The equation predicts that the time at which 50% of micro pipets remain within specifications is two years with tm=2Yr is,

Fraction within specification=e-t(ln2)/tm=e-2(ln2)/2=e-ln2=12

The given tm is plugged in above equation to give an equation to amount of micro pipets remain within specifications

Conclusion

The true mass of KNO3 should be determined.

(b)

Interpretation Introduction

Interpretation:

The time to recalibrated micro pipets should be calculated.

Concept introduction:

Fraction within specifications:

In the micro pipette specification, the relationship between fraction specifications with time is given by blow equation,

Fraction within specification=e-t(ln2)/tm

Where,

tm is time between failure time to correct time.

(b)

Expert Solution
Check Mark

Answer to Problem 2.29P

The time to recalibrated micro pipet is 54days

Explanation of Solution

To determine the time to recalibrated micro pipette.

Given,

tm=2Yr

The percentage for pipette are within the specifications is 95%

Fraction within specification=e-t(ln2)/tm0.95=e-2(ln2)/2

Take ln to both side.

ln(0.95)=-t(ln2)/2t=-2ln(0.95)/ln2=0.148yr=8weeks=54days

The percentage for pipette are within the specifications is plugged in above equation to give a time to recalibrated micro pipette.

The time to recalibrated micro pipet is 54days

Conclusion

The time to recalibrated micro pipet was calculated.

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