136. Solving a chemistry problem
19. How many moles of ammonium thiocyanate must be added to 1 dm3 of 5 * 10-5 molar solution of Hg (NO3) 2 in order to reduce the concentration of Hg2 -ion to 10-11 mol / dm3? K nest[Hg(CNS)4]2–=1*10-22
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