[PLUG-TALK] Chemistry help needed

[Rich Shepard]

On Mon, 23 Jul 2012, Aaron Burt wrote:

> Measure your water by weight, solve for % of salt.  I'm assuming you don't
> want much salt solution, so I'll start with a small amount of salt.
> According to http://www.easyunitconverter.com a teaspoon of salt weights
> 20g. (by way of a forum, by way of Google...) 20g / 0.0225 - 20g = 869g
> which is ~29oz.

   Physiological saline is 0.9% NaCl is is made by dissolving 9g NaCl in 1L
H2O. Ergo, for a 2.25% saline solution, dissolve 22.5g NaCl in a litre of
water.

   Other than molarity (which normally lives in the chemistry lab), the two
types of solution are weight/volume and volume/volume. Generally, a solid is
weighed and dissoved in a volume of liquid.

Rich