Question

Oblicz stężenie procentowe roztworu CuSO4 otrzymanego po rozpuszczeniu 500g CuSO4 * 5H20 w 500g wody.

Answer 1

mCuSO₄*5H₂O=64g+32g+4*16g+5(2*1g+16g)=160g+90g=250g

 

160g CuSO₄ --------------- 250g CuSO₄*5H₂O

xg CuSO₄ ------------------- 500g CuSO₄*5H₂O

 

xg=160g*500g/250g

xg=320g

 

ms=320g

mr=500g+500g=1000g

Cp=?

 

Cp=ms/mr * 100%

Cp=320g/1000g * 100%

Cp=32%

Answer 2

m CuSO4*5H2O = 64 + 32 + 4*16g + 5*18g = 250g

m CuSO4 = 64g + 32g + 4*16g = 160g

Obliczamy ile gram w hydracie stanowi CuSO4:

160g ------ 250g

x ----------500g

x = 160*500/250g = 320g CuSO4

m rr = 500g + 500g = 1000g - masa roztworu

Obliczamy Cp:

320g CuSO4 ----- 1000g roztworu

x --------------100g

x = 320g*100g/1000g = 32%