Answer to Question #166419 in General Chemistry for Kyle

Question #166419

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?.


1
Expert's answer
2021-02-25T03:41:04-0500

"\\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%.


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