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The density of a 3 M Na(2) S(2) O(3) (so...

The density of a `3 M Na_(2) S_(2) O_(3)` (sodium thiosulphate) solution is `1.25 g mL^(-1)`. Calculate:
a. % by weight of `Na_(2) S_(2) O_(3)`
b. Mole fraction of `Na_(2) S_(2) O_(3)`
c. Molalities of `Na^(o+)` and `S_(2) O_(3)^(2-)` ions.

Text Solution

Verified by Experts

The correct Answer is:
(a) `37.92` (b) `0.065`
(a)`m_("solution")=1000xx1.25=1250gm`
mass of `Na_(2)S_(2)O_(3)=3xx158=474`
`%(w//w)=(474)/(1250)xx100=37.92`
(b) `X_(Na_(2)S_(2)O_(3))=(3)/(3+43.11)=0.065`.
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