A 500 mg sample of each mixture was analyzed for its alkaline content using 0.1025 M HCl via double indicator method.
|
Mixture
|
1
|
2
|
3
|
4
|
5
|
|
V0-Ph (ml)
|
4.27
|
0.01
|
5.12
|
6.37
|
5.63
|
|
V0-Mr (ml)
|
10.18
|
6.19
|
10.24
|
6.38
|
9.04
|
(a) Calculate the purity of the sample containing NaHCO3 only?
(b) What is the % wt of NaOH for the sample containing a mixture of NaOH-Na2CO3?