<u>Гидрометаллургия </u>— выделение металлов из руд, концентратов и отходов производства с помощью водных растворов определённых веществ (химических реагентов)
<span>Essay on the 8th of March.March 8 is a holiday for women, for example mother's or grandmother's! On March 8 you need to congratulate friends of women you mother,grandmother or aunt who you have.The best gift on March 8 candy or flowers in my opinion, the best gift on March 8 mom or aunt this gift with your own hands and nice warm words.For the grandmother or mother will be very pleased.I think that March 8 is good.</span>
<span>2NaOH+H2SO4=Na2SO4+H2O </span>
N= 0.3 (моль)
m=n*M
M(H2O)=2*1+16=18 (г/моль)
m=0.3*18=5.4(г)
N(KOH) = CmxV = 4x10 = 40 моль
m(KOH) = nxM = 40x56 = 2240 г
m(KOH p-p) = m(KOH)/W(p-pa) = 2240/0,35 = 6400 г
т.к. р = 1,34 г/см3, то V(KOH 35 %) = m/p = 6400/1,34 = 4776 см3 = 4,776 л