2 replies to this topic

hi all,
Can some one tell me that when I mix two miscible liquids in weight ratios what is the equivalent density and viscosity???

[siretb]

You may try

Ln(viscosity) = SUM ( xi * Ln(visci) ) xi mole fraction of component i ; visci viscosity of pure component i
Ln designates the Natural logarith (base e)

do not use for mixtures like water -glycerol

You may also try Kendall & Monroe's rule viscossity = (SUM x1 * visci^0.333 )^3

[Mr. pH]

Can some one tell me that when I mix two miscible liquids in weight ratios what is the equivalent density and viscosity???

As for the density - there is no general, bulletproof method, as the volumes of the solutions are not additive. For example if you mix 50 mL of water and 50 mL of ethanol you will get no 100 mL of solution, but only 96.42 mL.

In general, to be able to correctly calculate density of mixture you need to use density tables. I suppose the same holds for viscosity, although that's only my (educated) guess.