12HCl+2CrO3=3Cl2+2CrCl3+6H2O
Cr6+----+3e-------Cr3+ окисл.2
Cl1------ -2e--------2Clo восст3
5Cd+2KMnO4+8H2SO4=5CdSO4+2MnSO4+K2SO4+8H2O
Cdo------ -2e--------Cd2+ восст.5
Mn7+------+5e----------Mn2+окисл.2
1. HNO3 = H(+) + NO3(-)
C(H+) = C(HNO3) = <span>0,0001 моль/л
pH = -lg H(+) = -lg </span><span>0,0001 =</span> 4
1. KOH = K(+) + OH(-)
C(OH-) = C(KOH) = <span>0,001 моль/л
pOH = -lg OH(-) = -lg </span>0,001 = 3
pH = 14 - <span>pOH =</span> 14 - 3 = 11