Question

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Ofer coroană

Answer 1

1. Na+ H2O = NaOH + 1/2 H2 ( reactie de substitutie )

CuSO4 + 2NaOH = Cu(OH)2 + Na2SO4 ( reactie de schimb )

2. Solutia de H2SO4 contine md = 10/100 * 61,25 = 6,125 g H2SO4

n H2SO4 = 0,0625 moli H2SO4

H2SO4 + 2NaOH = Na2SO4 + 2H2O

Asadar, n NaOH = 2 x 0,0625 = 0,125 moli NaOH => 5g NaOH

c NaOH = 8% , deci ms = 100/8 * 5 = 62,5 g solutie NaOH 8%