Evaluation of purity with its uncertainty value in high purity lead stick by conventional and electro-gravimetric methods

Table 7 Uncertainty due to balance of Ohaus make (200 g) and Sartorius make (41 kg)

Weight component	Balance used for weighing	Weight taken (g)	Uncertainty in weight as per certificate at k=2	Distribution	Standard uncertainty in total weight u(x)/x
Weight of the metal m(g)	Mettler AX 204 220g	2.015	0.0001	Normal	0.0001/2=0.00005
Weight of solution taken for PbO₂ deposition	do	50.5618	0.0001	Normal	0.0001/2=0.00005
Weight of PbO₂ deposited	do	0.0584	0.0001	Normal	0.0001/2=0.00005
Weight of solution taken for PbSO₄ deposition	do	50.5918	0.0001	Normal	0.0001/2=0.00005
Weight of PbSO₄ deposited	do	0.0741	0.0001	Normal	0.0001/2=0.00005
Weight of stock solution	Sartorius; CC3002; 41 kg	2012.734	0.269	Normal	0.269/2=0.1345

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