Why is a pencil, rather than a pen, used to draw the lines on your chromatograph

Question

Why is a pencil, rather than a pen, used to draw the lines on your chromatography paper? O to avoid the interference of ink with the chromatography results O to avoid the evaporation of the elution solvent O to increase the polarity of the elution solvent (mobile phase) to decrease the polarity of the elution solvent (mobile phase) O none of the above QUESTION 2 What is the sum of all coefficents when the following equation is balanced using the smallest whole- number coefficients? FeCl3 + Na2S Fe2Sg + NaCl O 13 O 12 O 24 QUESTION 3 In the below chromatogram, which sample has the largest Rf value?

Explanation / Answer

Q1)

The pen ink may be dissolved in solvent and interference with chromatography results.

Hence correct option is,

* To avoid the interference of ink with the chromatography results.

Q2)

The balanced chemical equation is as follows:

2FeCl3 + 3Na2S --------> Fe2S3 + 6NaCl

Sum of all coefficients : 2+3+1+6

* 12.

Q3)

Sample 4 have largest Rf value.

Rf = distance traveled by sample / distance traveled by solvent

Related Questions

Navigate

• Browse (All)
• Browse W
• Subjects

---

---

Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.