To make	units final product
start with	units ingredient 1
add:	units ingredient 2
add:	units ingredient 3
add:	units ingredient 4
add:	units ingredient 5
add:	units ingredient 6
add:	units ingredient 7
add:	units ingredient 8
add:	units ingredient 9
add:	units ingredient 10
add:	units ingredient 11
bring to	units ingredient 12
add:	units ingredient 13
autoclave for	units last ingredient

to make a final volume of:	mL
from this initial concentration:	ci
at this final concentration:	cf
start with:	mL stock solution

The + sign juxtaposes the two values, unless they are actual numerals.

So if a.value = 2 and b.value = 3 then a.value + b.value = 23

See calculator below:

Try to add	the first and
second number	together
the result =

But 2+3 = 5 if you write the numerals instead of the variable names.

subtraction works:
a.value - b.value = -1

You can cheat, as in this second calculator:
result.value = (- firstnumber.value - secondnumber.value) * -1

Not sure how to do plain old addition

Try to add	the first and
second number	together
the result =

size="5";

ingred.value = Math.round(calculation goes here)

ingred.value = Number(Math.round((finalvol.value * 0.0052)+'e2')+'e-2');

where 2 is the number of significant digits

Calculations with changeable MW

MW of stuff:
Concentration:	M
to make:	mL
add:	g dry stuff

Calculations with changing w/vol

to make:	mL solution
at this concentration:	mg/ml
add:	g dry stuff

Calculations with non-changing MW

Concentration:	input type = "text" onchange = "g.value = 58.44 * M.value * mL.value /1000" value="5" name="M"/> M
to make:	input type="text" onchange = "g.value = 58.44 * M.value * mL.value /1000"; value="1000" name="mL"/> mL
add:	input type="text" onchange = "g.value = 58.44 * M.value * mL.value /1000"; value="292.2" name="g"/> g dry stuff

if pH =
10^(ph-6.82)

if pH =
10^(pH)

if pH =
math.pow(10,pH)