Question

64,5 g 2-metil-3-hidroxi-1-butena se oxideaza cu dicromat de potasiu in mediu de acid sulfuric. Sa se calculeze volumul de solutie 1 M de acid sulfuric necesar oxidarii.

Answer 1

H2C=CH(CH3)-CH(OH)-CH3

K2Cr2O7 + 4H2SO4 -> K2SO4 + Cr2(SO4)3 + 4H2O + 3[O]

CH2=C(CH3)-CH(OH)-CH3 + 5[O] -> CO2 + H2O + OC(CH3)-CO(CH3)
86 g                                           5 moli

64,5.......................................x=3,75 moli [O]

 

4 moli H2SO4....................3 moli [O]

y moli...................................3,75 moli    y= 5 moli H2So4

1 L sol .............1M

z L......................5M   z= 5 L sol