Hosil bolgan eritmada Cu2+ va SO 2~ ionlari nisbati 4:5 bolishi uchun

181. (v20/21-138-11) Hosil bolgan eritmada Cu2+ va SO 2~ ionlari nisbati 4:5 bolishi uchun 256 g 12,5%li CuS04 eritmasiga nechi g NaOH ning 2%li eritmasidan qoshish kerakligini hisoblang. A)40 B)80 C)120
D) 160