You bring up a good point. After having examined the used glassware (measuring cylinder 250ml:5ml +-2ml at 20 C) the value of 1.55 is within the
expected deviation. Therefore I cannot rule out that we have 99.9% pure nitric acid, except for the urine like darkish yellow color.
Density was originally determined by using a weight with 4 significant digits and determining weight at 50ml, 100ml, 150ml, 200ml and 250ml
respectively. The density was calculated as the slope of the linear regression to the points. R^2=0.96
Still, we would like to know the nitric oxide content of the acid.
Kind regards,
Jeppe Nielsen, DSC
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