Dobrý deň, prosím, potrebovala by som poradiť s následovnou úlohou.
Vypočítajte hmostnosť 15% roztoku síranu sodného, ktorý treba pridať do 5% roztoku síranu sodného, aby sa pripravil roztok obsahujúci 12% síranu sodného.
Pri postupe by som mala použiť zmiešavaciu rovnicu a výsledok by mal byť 350g, no neviem si s tým nijako poradiť.
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