REAGENTS, Pakistan
A database about Preparation of Laboratory Reagents. A Project of SCIENCE Pakistan
SCIENCE Pakistan
Free Science Books
Pakistan Chemistry Club
Contact Us
skip to main
|
skip to sidebar
Chromic acid
Weigh out 10 g of sodium dichromate crystals, make it into a slurry with a few mls of watwer, then dissolve in 250mls conc. sulphuric acid with stirring and cooling (ice-bath), to give a thick syrupy dark brown mixture.(very corrosive!)
Share this post
0 comments
Loading
ShareThis
Reagent of the Day
Starch Solution
Triturate 0.5gm. of soluble starch with a little cold water into a thin paste and add 25ml. of boiling water.Boil until a clear solution is obtained (5-mins.). This solution should be freshly prepared as required. A more stable starch solution is obtained by adding 0.5gm. of potassium iodide and 2-3 drops of chloroform. A more satisfactory starch solution for use as an indicator is prepared as follows:* Mix 5.0 gm.of powdered sodium starch glycollate with 1-2 ml. ethyl alcohol, add 100ml. of cold water and boil for a few minutes with stirring.This 5% stock solution is stable for many months; it is diluted to 0.1% strength when required for use..=
Important Information
Acid-Base and metal ion titration Indicators
Adsorption Indicators
Calculate Concentration
Chemistry Lab Safety Rules
EDTA Indicators
Formulae for Reagent Preparation of Solid Chemicals
Lab Safety Guide
Quality Control For Analytical Reagents
REDOX Indicators
Sample Excerpt of Log Book for Reagents Record
Science Laboratory Safety Guide
Search Reagent Alphabetically
Labels
A
( 42 )
B
( 13 )
Books
( 1 )
C
( 27 )
D
( 13 )
E
( 5 )
F
( 11 )
H
( 6 )
I
( 6 )
Indicators
( 5 )
J
( 1 )
K
( 1 )
L
( 4 )
M
( 15 )
N
( 11 )
O
( 1 )
P
( 12 )
Q
( 4 )
Quality
( 1 )
R
( 3 )
S
( 32 )
T
( 8 )
U
( 1 )
X
( 1 )
Z
( 7 )
© 2014
REAGENTS, Pakistan
Posts RSS
∙
Comments RSS
Back to top
0 comments