Fifth lab An analysis of a mixture of Na2CO3 and NaOH using two indicators and a standard HCl solution

Fifth lab
An analysis of a mixture of Na2CO3 and NaOH using two indicators and a standard HCl
solution
Theory:
1- When a known volume of the mixture is titrated with HCl in presence of
ph. ph., the acid reacts with all the sodium hydroxide and with only half
Of the carbonate.
V1 = all hydroxide + 1/2 the carbonate
2- When a known volume of the mixture is titrated with HCl in presence of M.O., the acid reacts
with all the hydroxide and all the carbonate.
V2 = all hydroxide + all carbonate
Volume of HCl = 1/2 carbonate = V2 – V1 = V ml
Volume of HCl = all carbonate = 2V ml
Volume of HCl = NaOH = V2 - 2V ml
.
Procedure 2:
1-
Transfer with a pipette 10 ml of the mixture to a conical flask, and add one or two drops of ph.

Fifth lab
An analysis of a mixture of Na2CO3 and NaOH using two indicators and a standard HCl
solution
Theory:
1- When a known volume of the mixture is titrated with HCl in presence of
ph. ph., the acid reacts with all the sodium hydroxide and with only half
Of the carbonate.
V1 = all hydroxide + 1/2 the carbonate
2- When a known volume of the mixture is titrated with HCl in presence of M.O., the acid reacts
with all the hydroxide and all the carbonate.
V2 = all hydroxide + all carbonate
Volume of HCl = 1/2 carbonate = V2 – V1 = V ml
Volume of HCl = all carbonate = 2V ml
Volume of HCl = NaOH = V2 - 2V ml
.
Procedure 2:
1- Transfer with a pipette 10 ml of the mixture to a conical flask, and add one or two drops of ph.