y: R. B. Escuc, Jr.. North Texas State College, Denton . John L. Winslow, ILislett High School, Michigan
a
short lcl,e+,hof capillary
having small nozzles will require a large volume before attaining the same equilibrium condition. Changing the inflow rate
[-:
9
DRYING TUBE
NOZZLE TUBING RUBBER
Repeat with other units to be ort so that the REMARKS harged into t,he ~h~ reservoirs may be labelled for succesi~idkatedin the sive members of the sameradioactive series with the tubing playing the role of a longlived parent. For clarit,y, the drying tubes should be identical. A drop of ink or crystal of r a t e r from of K M n 0 4 may be added to the upper reserif'iio~le into the upper drying tube. The voir to improve observation from a distance. iter level will adjust so as to est,ablish an A single unit can be used to display equilibuilibrium conditioii such that the rate of rium in reversible reactions by relating inequal. This flow to rate of product production and outed in each reservoir. Those flow to rate of the opposing reaction. t i l l
-- . -. -. ..
~
~
.. .. . . -. . . . ~
of Chemical Education
-
October 1960
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'È
d quality zinc by t and replace hy covered with a shiny amalgam coating, remove
copper or platinum wire. Bubbles of hydrogen will be evolved from the wire-
Mossy zinc does not function as well as chemically pure sheet or rod. The equations for the half reactions are: Zn -r Zn++ 2e and 2H+ 2e HZ. This second reaction will not occur on the coated zinc metal because of the high overvoltage for hydrogen on mercury. When contact is made, the electrons will flow to the wire and there be supplied t o the hydrogen ions.
+
lace treated zinc in test tube and cover with dilute
i
+
d of Chemical E d w d i m
-
October 1960
