Page:Philosophical Transactions of the Royal Society A - Volume 184.djvu/357

Rh (After this, the velocity began to fall off, and the kathode solution (CaCl2) got thick and faintly blue, perhaps indicating that some current is conveyed by the water of crystallisation of the CoCl26H2O, which deposits a hydrate when it meets the calcium, and that some cobalt goes faster than the rest and colours the solution. Finally, the junction went the wrong way, and other secondary actions occurred. All this shows that the effect of too great concentration has not yet been eliminated.)

Taking the mean velocity while it remained constant we get $$\mathrm{G}=46^{\circ}.8$$, $$v=0.25$$ centim. per hour.

Therefore $$v_1=v\mathrm{A}/\gamma r=0.000022$$ centim. per second.

Adding this to the velocity of the chlorine (viz., 0.000026) we get

The conductivity is $$2.86 \times 10^{-13}$$, and on ’s theory this gives

Considering the difficulties of the method and the effect of too great concentration, these numbers must be considered to agree within the limits of experimental error.

The conductivity of the nitrate of cobalt is rather greater than that of the chloride. This means that the number of active molecules is larger, and that the salt more nearly approaches the normal state. We should therefore expect the agreement to be closer than in the case of the chloride.

The velocity of the cobalt was found by using cobalt and calcium nitrate solutions, the first being red, the second colourless. No irregularities (such as reversals, &c.) were detected with these salts. This is what would be expected from the better conductivity.

The result is

The velocity of the NO3 group can be calculated from the numbers in p. 356. The conductivity is $$3.80 \times 10^{-13}$$, and this gives

Therefore