TABLE 5.

Analytical results for purity of original La₂O₃ by the La₂(SO₄)₃ conversion method ^{a , b} .

Run no.	Weighed La2(SO4)3, g	Purity of original La2O3 c , %	Mass ratios of La2(SO4)3/La2O3 found/theoretical d
1	1.63359	99.947 ± 0.008	0.99970
2	1.66432	99.978 ± 0.006	0.99926
3	1.34344	100.049 ±0.007	1.00075
4	1.51412	99.948 ±0.008	1.00010
5	1.72069	99.963 ±0.006	0.99991
6	1.51479	99.965 ±0.013	0.99988
7	1.50312	99.942 ± 0.007	0.99947
8	1.54332	99.974 ± 0.006	0.99960
9	1.49184	99.962 ±0.006	1.00029
10	1.70475	100.001 ± 0.008	1.00012
	Mean	99.973 ± 0.013	0.99991

^aCalculated based on the weighing form as La₂(SO₄)₃.

^bEach value following "±" indicates combined standard uncertainty (k = 1).

^cThe purity value of original La₂O₃ was corrected by the mass fraction of impurities.

^dThe theoretical ratio of La₂(SO₄)₃/La₂O₃ = 1.7372.