1.

Concentration of SO_(4)^(2-) ions in a solution prepared by mixing 100 ml 0.1 M BaCl_(2) and 400 ml 0.2 M Na_(2)SO_(4).

Answer»

`(8)/(50)M`
`(7)/(50)M`
`(7)/(40)M`
`(1)/(25) M`

Solution :`{:(BaCl_(2),+,Na_(2) SO_(4),rarr,BaSO_(4),+,2NaCl,),(0.01 "mole",,0.08 "mole",,,,,),(-,,0.07 "mole",,UNDERSET(PPt darr)(0.01 "mole"),,0.01 "mole",):}`
`{:(Na_(2)SO_(4),rarr,2Na^(+),+,SO_(4)^(2-),),(0.07 "mole",,-,,-,),(-,,0.14 "mole",,0.07 "mole",):}`
`[SO_(4)^(2-)] = (n_(SO_(4)^(2-)))/(V_(1) + V_(2)) = (0.07)/(0.5) = (7)/(50) M`


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