Step1: Add 2 g pre-dried powdered sample in that crucible and record as Initial weight.
place crucible
add sample
ON
TARE
0.0 gms
Step2: Measure 200 ml of 0.128 M Sulphuric acid and pour in a conical flask
Measure 100ml
Step3: Add 2 gm sample into the conical flask
Pour sample
Step4: Put the sample flask on hot plate and boil for 30 mins
Turn on
Place flask
90C
After 30 minutes
Step5: filter the boiled sample solution using filter cloth
Place filter cloth
Filter sample
Remove sample
Step6: Measure 200 ml of 0.313 M Sodium hydroxideand pour in a conical flask
Measure 100ml
Step7: Mix the sample residue obtained in step 7 to the conical flask having NaOH
Add sample
Step8: Put the sample flask on hot plate and boil for 30 mins
Turn on
Place flask
90C
After 30 minutes
Step9: Filter the boiled sample solution using filter cloth
Place filter cloth
Filter sample
Remove sample
Step10: Collect the fibre in crucible
Collect sample
Step11: Set the temperature of hot air oven to 130C and dry for 2 hrs
Open Lid
Place Sample
PT 000C
ST 000C
After 2 hours
Step12: Weigh the sample crucible and record the weight
place crucible
ON
TARE
0.0 gms
Step13: Put this sample crucible in muffle furnace and set the temperature to 500°C
Open Lid
Place Crucible
Close Lid
Turn On
PT 000C
ST 000C
After 4 hours
Step14: Then take out sample crucible carefully with help of tong and confirm proper ashing of sample
Open Lid
Remove Crucible
Close Lid
Step15: Weigh the sample crucible and record the weight
place crucible
ON
TARE
0.0 gms
Result & calculation
Weight of sample (Ws)= 2 gm
Weight of crucible with fibre (Wf) = 22.15 gm
Weight of crucible with ash (Wa) = 22.08 gm
Crude fiber(%) = 22.15-22.08/2 = 0.035