At 18°C, the ionic mobilities of NH4+ and CrO42− ions are 6.6 × 10−8 and 5.4 × 10−8 m2 volt−1 s−1 at

Question

At 18°C, the ionic mobilities of NH4+ and CrO42− ions are 6.6 × 10−8 and 5.4 × 10−8 m2 volt−1 s−1 at infinite dilution. What is the molar conductance of ammonium chromate solution in Ω−1 m2 mol−1?

Accepted Answer

$\Lambda_{m}^{o}\left\lbrack \left( NH_{4} \right)_{2}CrO_{4} \right\rbrack = 2 \times \lambda_{m}^{o}\left( NH_{4}^{+} \right) + \lambda_{m}\left( CrO_{4}^{2 -} \right)$

$= \left( 2 \times 6.6 \times 10^{- 8} + 5.4 \times 10^{- 8} \right) \times 96500 $$$= 0.01795\Omega^{- 1}m^{2}\text{mo}\text{l}^{- 1}$$

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