υ= m/Mr См= υ/ V 2000мл=2 л
υ (NaCl)= 117 г/ 58.5 = 2 моль
См=2 моль/ 2л= 1 Моль/л
<span><span>K2Cr2O7</span> + <span>3<span>H2S</span></span> + <span>4 <span>H2SO4</span></span> → <span>K2SO4</span> + <span>Cr2<span>(SO4)</span>3</span> + <span>3 <span>S</span></span>+ <span>7<span>H2<span>O
</span></span></span></span><span><span>10<span>FeSO4</span></span> + <span>2 <span>KMnO4</span></span> + <span>8<span>H2SO4</span></span> → <span>5 <span>Fe2<span>(SO4)</span>3</span></span> + <span>2 <span>MnSO4</span></span> + <span>K2SO<span>4+8H2O
</span></span></span>
H2SO4+2KOH=K2SO4+2H2O
mвва(KOH)= 134.4г×0,1=13,44г
M(KOH)=57г/моль
n(KOH)=13,44г/57г/моль=0.2моль
по уравнению:
n(H2SO4)=1/2n(KOH)=0.1моль
M(H2SO4)=98г/моль
mвва(H2SO4)=0.1моль×98г/моль=9.8г
mрра(H2SO4)=9.8г/0.23=42.6г