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1.590 g/L Al(NO3)3, it means that you are certain that the true value is between 1.585 and 1.594. This means four significant digits, which is a high level of certainty. The uncertainty of this number is less than 1%.

When you write

0.017 g/L Ba(NO3)2, you are much less certain about the number (only two significant digits). This is an uncertainty of 10%.



Since weighing of chemicals should yield comparable uncertainties, you will have to round to a consistent number of significant digits, not digits after the decimal point.

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