Question

Se prepară 700g Sol. HNO3 de concentratie. 20%. Determina :
a) masele de acid si apă necesara;
b) masa solutiei de Ca (OH)2 de C= 40% necesara neutralizari
c). Continutul procentual de O al Ca (OH)2
RAPIIIID DAU COROANA​

Answer 1

Răspuns:

a) C = (100*Md) / Ms =>

Md = (C*Ms) / 100

Md = (20 * 700) / 100 = 20 * 7

Md = 140g HNO3

Ma = Ms - Md = 700 - 140

Ma = 560g H2O

b) Ca(OH)2 + 2HNO3=Ca(NO3)2 + 2H2O

74g 126g

74g Ca(OH)2 ....... 126g HNO3

Xg Ca(OH)2 ........ 140g HNO3

X = 82.22g Ca(OH)2

Ms = (100*Md) / C

Ms = (100*82.22) / 40

Ms = 205.55g solutie Ca(OH)2

c) M Ca(OH)2 = 40 + 34

M Ca(OH)2 = 74 g/mol

74g Ca(OH)2 ...... 32g O

100g Ca(OH)2 .... 43.24 % O