TEST: E + H2O(stirred)
INFERENCE: E is a mixture of salts
INFERENCE: Gas evolved is CO2 from HCO3- or CO3²-
TEST: residue + HNO3 + H2O
INFERENCE : CO2 gas is evolved from HCO3-or CO3²-
OBSERVATION: Blue gelatinous ppt soluble in drops. Soluble in excess to give deep blue ppt.
INFERENCE: Cu2+ present
INFERENCE : Zn²+, pb²+, Al³+ present
Zn²+, pb²+ present
OBSERVATION: White gelatinous ppt soluble in excess Nh3 solution
INFERENCE: Zn²+, pb²+, Al³+
TEST: Portion of filtrate of Ba(NO3)2 + HCL
INFERENCE: SO4²- or CO3²- present.
For acid NA; NB =1;1
Conc of A in moldm-³
=conc of A in gldm-³/molar mass in glmol
Conc of B in moldm-³=
Conc of A in gldm-³/molar mass in glmol
Molar mass of NaOH
1mole of HCl give 1mole NaCl
No of mole =mass/molar mass
Molar mass of NaCl=58.5glmole
Mass of NaCl =58.5*16.385
The indicator used is methyl orange because the titration is between the strong acid and strong base
Orange color would be shown at the end point .
The most important monosaccharide is glucose, the bodyâ€™s preferred
energy source. Glucose is also called blood sugar, as it circulates in
the blood, and relies on the enzymes glucokinase or hexokinase to
Sucrose is commonly known as table sugar, and is obtained from sugar
cane or sugar beets. Fruits and vegetables also naturally contain
(i)before end point ----> dark color
(ii)at the end point ----> colourless
(i)soda lime is preferred because it does not attack rubber nor dry.
(ii)it is not deliquescent
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