Dobrý deň, ako by sa má vypočítať tento príklad?
Koľko gramov NaOH musíme odvazit, aby sme pripravili 500cm3 roztoku s koncentráciou 0,1 mol/dm3
Príklad mi vysiel takto: m=2g, lebo látkové množstvo je 0,05 mol (0,1 mol/dm3 x 0,5dm3 )
Hmotsnost som vypočítala ako m=Mr (40) x 0.05
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