Question

In: Chemistry

How is plate height affected (increased, decreased, unchanged) by each of the following, briefly justifying your...

How is plate height affected (increased, decreased, unchanged) by each of the following, briefly justifying your answer in each case:

A. very high linear flow velocity

B. longer column length

Expert Solution

Ans A: According to Van deemtrental equation

HETP= A+ ( B/) +(Cs + Cm)

HETP- Height equivalent to theoretical plate

A- Eddy- diffusion

B- longitudinal Diffusion of eluting particles

C- Resistance to mass transfer coefficient between Mobile phase and stationary phase

- linear velocity

If linear velocity() is increased the longitudinal diffusion (B) decreases and plate height will also decrease.

If linear velocity() is decreased the longitudinal diffusion (B) increases and plate height will also increase.

If linear velocity () is unchanged the longitudinal diffusion (B) will not change and plate height will also remain unchanged.

Ans B)

H= L/ N

H- Plate height

L- Column length

N- Number of theoretical plates

The plate height will increase if column length is increased.

The plate height will decrease if column length is decreased.

The plate height will remain unchanged if the column length is not changed.

queen_honey_blossom answered 2 years ago

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