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mKOH=56u
mZn(OH)₂=98u
a) ZnCl₂ + 2KOH ---> Zn(OH)₂ + 2KCl
136g soli ----- 2*56g KOH
3,4g soli ------ xg KOH
x = 2,8g KOH
136g soli ---- 98g Zn(OH)₂
3,4g soli ------ xg Zn(OH)₂
x = 2,45g Zn(OH)₂
b) Zn(OH)₂ + 2KOH ---> K₂[Zn(OH)₄]
98g Zn(OH)₂ ----- 112g KOH
2,45g Zn(OH)₂ ---- xg KOH
x = 2,8g KOH