Thanks again Adam.
The Rex Allers article suggests obtaining a hydrometer to monitor the
density of the etchant, which should start out at a density of 1.17
g/mL, and will increase as copper dissolves into the solution. He
suggests a hydrometer with an expanded scale of 1.15 to 1.25 g/mL.
According to my tentative understanding a range of 19 to 31 Baume
would work here, does this seem right?
I note that American Science and Surplus has some Chinex lab glassware
(student grade) at low prices. The beaker and erlenmeyer flasks are
available in the sizes you suggest:
http://www.sciplus.com/category.cfm?subsection=4Would any of their pipettes do the trick?
The Rex Allers article shows titration using the burette and beaker,
is the erlenmyer flask better in some way?
Grant
--- In
Homebrew_PCBs@yahoogroups.com, adam Seychell
<adam_seychell@y...> wrote:
> No reason I can think of. picnic coolers are cheap, and have a good
lid. I built
> my tanks because I needed those dimensions. I coudnl't find anything
off the
> shelf that was narrow and deep enough, base = 45x250mm high = 350 mm.
> Any of the food plastics are ok with strong acids.
> Now you only concern is getting hold of some lab equipment.
>
> Here is lab order list.
>
> 1 ∗ 5 ml class B volumetric pipette
> (preferred to graduated pipette)
> (buy a second in case you break it)
> 1 ∗ rubber bulb pipette sucker
> 1 ∗ 125 ml dropper bottle for indicator (makes life easier)
> 1 ∗ 50 ml glass burette, class B.
> 1 ∗ 0-50°C (or 0-100°C) glass thermometer
> 1 ∗ 250 ml erlenmeyer flask
> 1 ∗ Bromophenol Blue indicator
> (1 gram will last you ever and a day)
>
>
> You also have to make some kind of stand to hold the burette, I made
something
> out of wood that was a ∗LOT∗ cheaper than buying a dedicated stand.
Fasten the
> burette with rubber bands to a length of wood, and hold that by a
stand from a
> heavy base using a diagonal pole. The area under the burette nozzle
needs to be
> free to place the erlenmeyer flask.
>
> The deionized water and sodium hydroxide is available from most
supermarkets.
> You also need some ethanol to make up the bromophenol blue
indicator. Its
> probably better to get the right indicator rather trying to use
turmeric power
> because it will be easier to see the end point of the titration,
which makes the
> job easier to carry out.