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Determina masa solutiei de naoh de concentratie 40% ce se poate obtine in urma electrolizei a 585 kg nacl de puritate 80% la un randament de 75%. Cata h2o trebuie adaugata naoh format, pentru a obtine o solutie de concentratie 1%? Dau coroana

Răspuns :

Neoclipcsid

Răspuns:

a) m NaCl = 80%*585 = 468kg NaCl pur

2*58.5 2*40

2NaCl + 2H2O = 2NaOH + Cl2 + H2

468 x

(2*58.5) kg NaCl ................ (2*40) kg NaOH

468 kg NaCl ....................... x

=> x = 320kg NaOH

Ct NaOH = 320kg

Cp NaOH = 75%*320 = 240kg NaOH

msol NaOH = 100/c% * md = 100/40 * 240 = 600kg sol NaOH c% = 40%

b) 100kg solutie ...................... 1 kg NaOH

(600 + x) ............................ 240kg NaOH

=> x = 23400 kg H2O trebuie adaugat

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