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Chapter 25: Q16P (page 708)

Microporous silica particles with a density of2.2g/mLand a diameter10渭尘of have a measured surface area of calculated the surface area of the300m2spherical silica as if it were simply solid particles what does this calculation tell you about the shape or porosity of the particles.

Short Answer

Expert verified

Microporous silica particles with a density calculation tell you about the shape or porosity of the particles.

First we calculate volume of sphere:

v=43.蟺谤3v=43.蟺5.10-4cm3p=0.27m2

Step by step solution

01

definition of volume

The amount of three-dimensional space enclosed by a closed surface is expressed as a scalar quantity.

First we calculate volume of sphere:

v=43.蟺谤3v=43.蟺5.10-4cm3p=5.24.10-4cm3

Then we calculate mass of one sphere:

m=蚁.vm=2.2g/mL.5.24.10-10mLm=1.15.10-9g

So, the number of particles in 1 g is:

role="math" localid="1654843608416" N=1g1.10.10-9gN=8.7.108

02

Step 2:surface one particle

The surface of one particle is:

p=4.蟺谤2p=4.蟺5.10-6m2p=3.14.10-10m2

Now we calculate surface of particles:

p=3.10.10-10m2.8.7.102p=0.27m2

The measured surface area is 300m2, so the particles have irregular shapes and they are porous.

Hence,

p=0.27m2

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Most popular questions from this chapter

(a) List ways in which the resolution between two closely spaced peaks might be changed.

(b) After optimization of an isocratic elution with several solvents, the resolution of two peaks is 1.2How might you improve the resolution without changing solvents or the kind of stationary phase?

(a). Sketch a graph of the van Deemnter equation (plate height versus linear flow rate).what would the curve look like if the multiple path term were 0? If the longtitundinal diffusinal diffusion term were 0?

(b). Explain why the van Deemter curve for 1.8渭尘particles in figure 25-3is nearly flat at high flow rate.what can you say about each of the terms in the van Deemeter equation for 1.8渭尘particles.

(c). Explain why the 2.7渭尘superficially porous particle enables separations similar to those achieved by 1.8渭尘totally porous particles,but the superficially porous particle requires lower pressure.

(a) use figure 25-28a select a tetrahydrofurn/water mobile phase strength of equivalent strength to 80%methanol.

(b)Describe how to prepare 1 L of this tetrahydrofurn mobile phase.

(c)what limitation would be imposed by the use tetrahydrofurn.

Why are the relative eluent strengths of solvents in adsorption chromatography fairly independent of solute?

In hydrophilic interaction chromatography (HILIC), why is eluent strength increased by increasing the fraction of water in the mobile phase?
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