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A mixture contains only sodium chloride and potassium chloride. a 0.1586-g sample of the mixture was dissolved in water. it took 22.90 ml of 0.1000 m agno3 to completely precipitate all the chloride present. what is the composition (by mass percent) of the mixture?

Respuesta :

W0lf93
moles AgCl = moles Cl- = 0.02290 L x 0.1000 M = 0.002290 let x = mass NaCl ( molar mass = 58.44 g/mol) let y = mass KCl ( molar mass =74.55 g/mol) x + y = 0.1586 x / 58.44 + y / 74.55 = 0.002290 74.55 x + 58.44 y=9.98 74.55 ( 0.1586 - y) + 58.44 y = 9.98 11.8 - 74.55 y + 58.44 y = 9.98 1.82 = 16.11 y y = 0.113 g % KCl = 0.113 x 100/0.1586=71.2