Molecular mass of potassium permanganate

\( \newcommand\) • • • • • • • • • • • • Learning Objectives • To use titration methods to analyze solutions quantitatively. To determine the amounts or concentrations of substances present in a sample, chemists use a combination of chemical reactions and stoichiometric calculations in a methodology called quantitative analysis A methodology that combines chemical reactions and stoichiometric calculations to determine the amounts or concentrations of substances present in a sample.. Suppose, for example, we know the identity of a certain compound in a solution but not its concentration. If the compound reacts rapidly and completely with another reactant, we may be able to use the reaction to determine the concentration of the compound of interest. In a titration An experimental procedure in which a carefully measured volume of a solution of known concentration is added to a measured volume of a solution containing a compound whose concentration is to be determined., a carefully measured volume of a solution of known concentration, called the titrant The solution of known concentration that is reacted with a compound in a solution of unknown concentration in a titration., is added to a measured volume of a solution containing a compound whose concentration is to be determined (the unknown). The reaction used in a titration can be an acid–base reaction, a precipitation reaction, or an oxidation–reduction reaction. In all cases, the reaction chosen for the analysis must be fa...

Before being able to calculate the equivalent mass, you need to calculate the molar mass of potassium permanganate. Looking at a periodic table and rounding works fine. K = 39 g/mol Mn = 55 g/mol O = 16 g/mol (multiply by 4 because there are 4 oxygens) 39 + 55 + (16 x 4) = 158 g/mol The molar mass of potassium permanganate is 158 g/mol. To find the equivalent mass, divide that molar mass by the mols of electrons taken in its half reaction. That would be five. 158/5 = 31.6 grams/equivalent. The above is the most common half reaction using potassium permanganate as an oxidizer in an acidic solution. It can be used as an oxidizer in a basic solution too. This is not as common, and it does yield a different answer. This half reaction would use 3 electrons. 158/3 = 52.7 grams/equivalent. See eNotes Ad-Free

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