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konsentrasi NaS2O3.5H2O 0,12M
massa NaS2O3.5H2O = 200 mg = 2 gram
Mr = 225
mol = massa/Mr = 2/225 = 0,00888mol
ditanyakan = mL akuades yg harus dilarutkan
jawaban ...
Konsentrasi = mol/Volume
Volume = mol/Konsentrasi
= 0,00888/0,12
= 0,074 Liter
= 74 mL
jadi volume aquades yang harus dilarutkan adalah sebanyak 74 mL