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Chemistry Forums for Students => Analytical Chemistry Forum => Topic started by: cyk78 on November 07, 2020, 12:42:34 PM

Title: Calculation of molar concentration
Post by: cyk78 on November 07, 2020, 12:42:34 PM

Can anyone help me to solve the problem?
Calculate the molar concentration of 8.45 ± 0.04 mL ammonia solution with a density of 0.2517 ± 0.0046 g/mL which was diluted to 0.5000 ± 0.0002L

Title: Re: Calculation of molar concentration
Post by: chenbeier on November 07, 2020, 12:59:44 PM

Not Impossible , because percentage or concentration of the given solution missing.

Title: Re: Calculation of molar concentration
Post by: mjc123 on November 07, 2020, 03:30:01 PM

You could compare the density with tables of density vs. concentration, e.g. https://wissen.science-and-fun.de/chemistry/chemistry/density-tables/density-of-ammonia/. Unfortunately, no aqueous ammonia solution has a density of 0.2517 g/mL, so there must be a mistake in the question. (Should that be an ammonia concentration of 0.2517 g/mL?)