Ap Chemistry

posted by Blanca

a mixture contains only sodium chloride and potassium chloride. a .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?

  1. DrBob222

    Two equations and two unknowns. Solve simultaneously.

    eqn 1.
    g NaCl + g KCl = 0.1586g

    eqn 2.
    mol AgCl from NaCl + mol AgCl from KCl = mol AgCl total

    Now put those into math form.
    Let X = g NaCl
    and Y = g KCl
    MM stands for molar mass.
    ---------------------
    eqn 1.
    X + Y = 0.1586 g

    eqn 2.
    (X/MM NaCl) + (Y/MM KCl) = 0.02290*0.1000

    Find X and Y, then
    %NaCl = (X/0.1586)*100 = ?
    Post your work if you get stuck.
    ^KCl = (Y/0.1586)*100 = ?

  2. fsbhded

    35

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