Question

The concentration of an aqueous solution of sodium hydroxide is prepared by weighing 5.0 grams of solid NaOH (MW = 40.0 grams per mole) using an analytical balance with a standard deviation of 0.001 gram. The solid is then dissolved in enough distilled water to the full volume of a 1-L volumetric flask whose standard deviation is 5.0 milliliters. What is the uncertainty/standard deviation of the computed molar concentration of the NaOH solution?.

Answer 1

$\frac{0.001}{5.0}\times100$% = 0.02%

$\frac{5.0}{1000}\times100$% = 0.5%

0.5%+0.02% = 0.52%

Answer: d = 0.52%.