Na, c, ho, are added into different test-tubes to the sol of fetoh), 1. electrolytes nacll, na co ,, (which is stabilized with feoci) for coagulation of this sol.write down the micelle formuia.what sign of charge have the particles of given sol gor? what electrolyte will have the least coagulation threshold? confirm your answer
Mg + H2SO4 = MgSO4 + H2 (2)
Zn + 2NaOH(изб.) + 2H2O = Na2[Zn(OH)4] + H2 (3)
Mg + NaOH #
n(H2) (3) = V/Vm = 13,44 / 22,4 = 0,6 моль
n(H2) (3) = n(Zn) (3) = n(Zn) (1) = n(H2) (1) = 0,6 моль
m(Zn) = M*n = 65 * 0,6 = 39 г
n общая(H2) (1,2) = V/Vm = 22,4 / 22,4 = 1 моль
n(H2) (2) = n общая(H2) - n(H2) (1) = 1 - 0,6 = 0,4 моль
n(H2) (2) = n(Mg) = 0,4 моль
m(Mg) = M*n = 24 * 0,4 = 9,6 г
m смеси = m(Zn) + m(Mg) = 39 + 9,6 = 48,6 г
w(Mg) = m(Mg) / m смеси * 100% = 9,6 / 48,6 *100% = 19,753 %
ответ: 19,753%