7. Calculate the mole fraction of the solute and solvent mole fraction of a solution consisting of

2.1 Mixtures and solutions. Types of mixtures: homogeneous and heterogènies.Mètodes for the separation of mixtures. Sedimentation, filtration, crystallization, distillation, solvent extraction and chromatography. Apparatus for the separation of mixtures: centrifuge, decanting alfa tek funnel and sieve or filter.
02.04. Concept concentració.Maneres express the concentration alfa tek of a solution. Percent mass (% M). Percent by volume (% V). Volume-volume percentage (% RR). Molalitat (m) molarity (M). Mole fraction (Xi). Mil.lió parts (ppm).
05.02. Examples of solving problems and expressing alfa tek the composition of the solutions in percentage by weight and percentage by volume ppm mass concentration and amount of substance concentration
6. Parts per million, ppm, express milligrams of solute per kilogram of solution. This unit is used in very dilute solutions. Calculate alfa tek the concentration in ppm of a solution 0.01% (M) of sodium nitrate (NaNO3). alfa tek R: 100 ppm
7. Calculate the mole fraction of the solute and solvent mole fraction of a solution consisting of 30 grams of sodium chloride (NaCl) and 500 grams of water. Check that the sum of the two mole fractions equals unity. R: 0.018 and 0.982
8. The solubility of lead sulfate (II) PbSO4 in water at the working temperature is 0.038 grams / liter. Calculate alfa tek the mass of solute containing 2 liters of saturated solution and the molarity of this solution. R: 0.076 g and 0.000125 M
9. We have an aqueous solution of hydrochloric acid, HCl, to 10% by mass. If the density of this solution is 1056 kg/m3 calculated: alfa tek a) molarity. b) molalitat. c) the mole fractions of solute and solvent. A: 2.89 M, 3.04 m, 0.052 and 0.948
10. Choose the correct answer from the three proposed. The sodium hypochlorite is the main component of the bleach. If you have a bleach to 30% by volume of sodium hypochlorite (NaClO), contain this ... a) 30 g NaCl in 100 grams of water. b) 30 liter NaCl in 100 liters of water. c) 30 liters to 100 liters of NaCl solution.
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