Chapter 25: Q7P (page 707)

If along $15 cm$ HPCL column has a place height of 5.0 what will be the half-width (in seconds) of a peak eluted at 10.0min? if plate height $5 μm$ ,what will be $w_{1 / 2}$ ?

Short Answer

Expert verified

The half-width (in seconds) of a peak eluted.

$L = 15 cm H = 5.0 μm = 5.0 . 10^{- t} cm = \frac{15 cm}{5.0 . 10^{- 4} cm} = 3 . 10^{4} 3 . 10^{4} and 2 . 05^{- 5} s$

Step by step solution

definition of Theoretical plate

Theoretical plate height is a measure of a column's separating efficiency, similar to the number of separating plates in a liquid distillation column.

Given,

$L = 15 cm H = 5.0 μm = 5.0 . 10^{- t} cm$

First we find the number of theoretical plates, N:

$H = \frac{L}{N} \Rightarrow N = \frac{L}{H} N = \frac{L}{N} = \frac{15 cm}{5.0 . 10^{- 4} cm} = 3 . 10^{4} t_{r} = 10.0 \min = 600 s$

Divide the value

Use this and the equation below to find and calculate the half-width in seconds:

$N = 5.55 {(\frac{T_{r}}{w_{1 / 2}})}^{2} w_{1 / 2} = \frac{5 . 55^{2} -}{N^{2}} t_{r} = 2.05 . 10^{- 5} s Hence, 3 . 10^{4} and 2.05 . 10^{- 5} s$

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If along $15 cm$ HPCL column has a place height of 5.0 what will be the half-width (in seconds) of a peak eluted at 10.0min? if plate height $5 μm$ ,what will be $w_{1 / 2}$ ?

Short Answer

Step by step solution

definition of Theoretical plate

Divide the value

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If along 15cmHPCL column has a place height of 5.0 what will be the half-width (in seconds) of a peak eluted at 10.0min? if plate height5μm,what will bew1/2?

Short Answer

Step by step solution

definition of Theoretical plate

Divide the value

One App. One Place for Learning.

Most popular questions from this chapter

Recommended explanations on Chemistry Textbooks

Physical Chemistry

Ionic and Molecular Compounds

The Earths Atmosphere

Inorganic Chemistry

Nuclear Chemistry

Making Measurements

Study anywhere. Anytime. Across all devices.

If along $15 cm$ HPCL column has a place height of 5.0 what will be the half-width (in seconds) of a peak eluted at 10.0min? if plate height $5 μm$ ,what will be $w_{1 / 2}$ ?