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I've recently conducted a viscosity experiment to find the relationship between alkali metal ions, the concetration of the solution, and the viscosity of the solution. We used the Oswald viscometer to determine the viscosities of $(\pu{0.5 M}, \pu{0.25M}, \pu{0.125M}, \pu{0.0625M})$ solutions of $(\ce{LiNO3}, \ce{NaNO3}, \ce{KNO3})$, and found that the while the viscosities of the $\ce{LiNO3}$ and $\ce{NaNO3}$ solutions increased as the concentrations of their solutions increased, the viscosity of the $\ce{KNO3}$ solution would instead decrease.

And so we ask:

  1. What is the relationship between the viscosity of a alkali-metal nitrate solution and the variant of the alkali metal ions within?

  2. Why would the viscosity of the $\ce{KNO3}$ solution decrease with concentration?

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  • $\begingroup$ Were the effects significant, to begin with? $\endgroup$ – Ivan Neretin Jul 5 '17 at 7:20
  • $\begingroup$ And was the temperature held constant? $\endgroup$ – porphyrin Jul 5 '17 at 7:47
  • $\begingroup$ The experiment was held in draft chamber conditioned to 25℃, and temperature of the water before the experiment measured 25.2℃. $\endgroup$ – user47268 Jul 5 '17 at 11:06
  • $\begingroup$ So the viscosity of pure water was higher than the viscosity of any of the KNO3 solutions, right? $\endgroup$ – Chet Miller Jul 5 '17 at 11:09
  • $\begingroup$ @ChesterMiller Yes, sir. $\endgroup$ – user47268 Jul 5 '17 at 11:15

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