Question

Va rog daca ma puteti ajuta cu astea 1:calculati compozitia proncetuala aHCL si H2SO4 .
2.Care este masa solutiei de acid clorhidric de c=36,5% necesara neutralizarii a 250g solutiei de NaOH de c=20%

Answer 1

M HCl=36,5
36,5g HCl.......1gH....35,5gCl
100gHCl...........x.........y
M H2SO4=98
98g H2SO4......2gH......32g S......64g O
100g..................x..............y..........z

NaOH+HCl---->NaCl+H2O

md NaOH=ms*c/100=250*20/100=50 g
din ecuatie;
40gNaOH.........36,5gHCl
50g NaOH.............x=45,62 gHCl(md)
ms=md*100/c=45,62*100/36,5=125 g