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Chapter 0: Q3P (page 1)

What does the designation 200/400mesh mean on a bottle of chromatography stationary phase? What is the size range of such particles? Which particles are smaller,100/200or 200-400mesh?

Short Answer

Expert verified

200/400 mesh are smaller.

Step by step solution

01

Meaning of designation 200-400 mesh

Designation 200-400mesh means that the particles move through mesh screen, whereas it doesn’t move through mesh screen.

02

Size Range

The size range of 200/400 mesh particles is 38-75 mm.

03

Comparison of meshes

200/400 mesh particles are smaller in size than 100/200 mesh.

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Most popular questions from this chapter

25-1 What should be the volume flow rate and injected volume for a 1.5-mm-diameter column?

Write the $K_{a 2}$ reaction of phosphoric acid $(H_{3} {PO}_{4})$ and the $K_{b 2}$ reaction of disodium oxalate $({Na}_{2} C_{2} O_{4})$ .

A solid mixture weighing 0.05485 gcontained only ferrous ammonium sulphate and ferrous chloride. The sample was dissolved in $1 {MH}_{2} {SO}_{4}$ , and the ${Fe}^{2 +}$ required 13.39 mL oflocalid="1663577431957" $0.01234 {MCe}^{4 +}$ for complete oxidation to localid="1663577453691" ${Fe}^{3 +}$ . Calculate the weight percent of Cl in the original sample. If you need refreshing, see Section 7-2 for an example of a titration of a mixture.

localid="1663574328546" ${FeSO}_{4} \times {({NH}_{4})}_{2} {SO}_{4} \times 6 H_{2} O {FeCI}_{2} \times 6 H_{2} O$

Ferrous ammonium sulfate Ferrous chloride

FM 392.13

FM 234.84

Find the area from $800$ to $1000$ hours.

A titration curve for Na2CO3 titrated with HCl is shownhere. Suppose that both phenolphthalein and bromocresol green arepresents in the titration solution. State what colors you expect to

observe at the following volumes of added HCl:

2 mL; (b) 10 mL; (c) 19 mL.

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