Limewater Dispenser Bottle Limewater is typically prepared by adding a n excess of calcium oxide or hydroxide to water, shaking it up well, and allowing the excess solid to settle to the bottom of the container. The saturated solution of calcium hydroxide (limewater) i s then removed using a siphon-type arrangement. Inevitably, some student will allow the limewater to siphon out completely, lift the tubing above the liquid level in the bottle (resulting in a loss of siphon), or, worse yet, shake nn -- the bottle I wish tb deacrihe a mod~licatiunthat docs not require the use of a siphon and that at the same time partially filter~the solution, in the event rhor the contents are shaken A hale is furmcd in a 4-Lplastic borrlc ic.g.. methanol container, about 2 cm from rhr hottorn usmg a pwce of hut glass tuhing. Whle the plnstic is stdl soil, the sprrnud endofa auirk-d~seonneettubineronnwtor 1.3 mserted in the hole. It is then seared in d a c e m i n e hat-melt elue. Atilter is made hv attachhe a piece of tubing (GZ-in. i.d. &d about 5-cm long) tothis fitting, and attnchine the other filline it with "~~ elass w d or ahsarhent cotton. ~~~~~, ~~~half of the qwck disconnect fittmg to hold the filtering material in position A 40-cm len~qhof tuhing i i attached to this fining; u, its orhcr end 19 attachcd a piece of lass tubing k n t at shout 90". A second hole, slightly larger than the glass tubing, is formed near the top of the bottle in which to insert the glass tubing when finished with removing some limewater. The original cap is kept in position. To obtain limewater, the glass end is removed from its rest position and lowered until the solution runs out. To stop the flow, the tube is simply returned to its rest position.
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H. Brouwer Redeemer College Ancaster. ON L9G 3N6
582
Journal of Chemical Education
