Pyrolusite (MnO2) is dissolved in hydrochloric acid: MnO2 + HCl → MnCl 2 + H2O + Cl 2 The chloride was passed into potassium iodide solution where it liberated iodine: 2 2 Cl + KI → KCl + I The iodine liberated was estimated by adding sodium thiosulfate, the reaction being 2 Na2 S2O3 NaI Na2 S4O6 I + → + If 5.6 g of crystallized sodium thiosulfate, Na2 S2O3  5H2O , were used up, how many grams of manganese were present? MW (g/mole): I =126.9; Mn =54.94; Cl = 35.45; K = 39.09; Na = 23; S = 32

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Units and Dimensions

Dimensions are the basic concepts of the measurement of quantities. Units are the means of expressing the dimensions. For instance, an area has a dimension of L2 and a unit of m2.