GCSE Chemistry Required Practical: Calculating Retention Factors - Revision history

NRJC: /* Method */

2020-01-19T19:04:28Z

‎Method

NRJC at 19:04, 19 January 2020

2020-01-19T19:04:18Z

NRJC at 11:29, 13 April 2019

2019-04-13T11:29:39Z

NRJC: /* Meaning */

2019-04-08T11:13:27Z

‎Meaning

NRJC: /* Key Stage 4 */

2019-01-29T11:37:54Z

‎Key Stage 4

NRJC: /* Key Stage 4 */

2019-01-29T11:36:59Z

‎Key Stage 4

NRJC: /* Method */

2019-01-29T11:36:16Z

‎Method

NRJC: Created page with "==Key Stage 4== ===Meaning=== Use a Chromatography experiment to produce a Chromatogram and calculate the Retention Factors (R_f) fo..."

2019-01-29T11:19:14Z

Created page with "==Key Stage 4== ===Meaning=== Use a Chromatography experiment to produce a Chromatogram and calculate the Retention Factors (R<sub>f</sub>) fo..."

New page

==Key Stage 4==
===Meaning===
Use a [[Chromatography]] [[experiment]] to produce a [[Chromatogram]] and calculate the [[Retention Factor|Retention Factors (R<sub>f</sub>)]] for they [[dye]]s found within different [[ink]]s.

===Method===
{| class="wikitable"
|-
|[[File:ChromatographyDiagram.png|center|500px]]
|}

@@ Line 14: / Line 14: @@
 #Use a ruler to measure the distance that the different [[dye]]s have traveled up the paper.
 #Use the following equation to find the [[Retention Factor]] for each [[dye]]
-:<math>R_f = \frac{d_c}{d_s}</math>
+<math>R_f = \frac{d_c}{d_s}</math>
 :Where:
 :R<sub>f</sub> = [[Retention Factor]]
 :d<sub>c</sub> = distance moved by the [[chemical]]
 :d<sub>s</sub> = distance moved by the [[solvent]]

@@ Line 13: / Line 13: @@
 #Use a ruler to measure the distance that the [[solvent]] has traveled up the paper.
 #Use a ruler to measure the distance that the different [[dye]]s have traveled up the paper.
-#Use the following equation to find the [[Retention Factor]] for each [[dye]]:
+#Use the following equation to find the [[Retention Factor]] for each [[dye]]
 :<math>R_f = \frac{d_c}{d_s}</math>
 :Where:

@@ Line 9: / Line 9: @@
 #Suspend the [[chromatography]] paper in a suitable [[solvent]] just below the pencil line with most of the paper above the [[solvent]].
 #Wait until the [[solvent]] stops rising up the paper.
-#Remove the paper from the [[solvent]] and allow it to dry.
+#Remove the paper from the [[solvent]] and draw a pencil line at the boundary between the dry and wet areas, then leave the paper to dry completely.
 #Use a ruler to measure the distance that the [[solvent]] has traveled up the paper.
 #Use a ruler to measure the distance that the different [[dye]]s have traveled up the paper.

@@ Line 9: / Line 9: @@
 #Suspend the [[chromatography]] paper in a suitable [[solvent]] just below the pencil line with most of the paper above the [[solvent]].
 #Wait until the [[solvent]] stops rising up the paper.
 #Use a ruler to measure the distance that the [[solvent]] has traveled up the paper.
 #Use a ruler to measure the distance that the different [[dye]]s have traveled up the paper.

@@ Line 4: / Line 4: @@
 ===Method===
-{| class="wikitable"
+#Take a piece of [[chromatography]] paper of [[width]] 6cm and [[height]] 10cm.
-|-
+#Using a ruler draw a line with pencil across the [[width]] 2cm up from the end.
-|[[File:ChromatographyDiagram.png|center|500px]]
+#Add a dot of each unknown sample on the pencil line at 1cm [[interval]]s.
-|}
+#Suspend the [[chromatography]] paper in a suitable [[solvent]] just below the pencil line with most of the paper above the [[solvent]].

@@ Line 1: / Line 1: @@
 ==Key Stage 4==
 ===Meaning===
 Use a [[Chromatography]] [[experiment]] to produce a [[Chromatogram]] and calculate the [[Retention Factor|Retention Factors (R<sub>f</sub>)]] for they [[dye]]s found within different inks.

GCSE Chemistry Required Practical: Calculating Retention Factors - Revision history

NRJC: /* Method */

NRJC at 19:04, 19 January 2020

NRJC at 11:29, 13 April 2019

NRJC: /* Meaning */

NRJC: /* Key Stage 4 */

NRJC: /* Key Stage 4 */

NRJC: /* Method */

NRJC: Created page with "==Key Stage 4== ===Meaning=== Use a Chromatography experiment to produce a Chromatogram and calculate the Retention Factors (Rf) fo..."

NRJC: Created page with "==Key Stage 4== ===Meaning=== Use a Chromatography experiment to produce a Chromatogram and calculate the Retention Factors (R_f) fo..."