If you have got a fine gauze, we have some without the heat proof white circle in the middle, you might be ale to file the tube down using the gauze as the file. Might need a polish in the bunsen flame after just to smooth off any rough edges.
Yep, use a cork borer, or more than one. Start off with a small one and work your way up to one that's just bigger than the the glass tube you want to insert, alternating inserting from top to bottom, using a bit of washing up liquid as a lubricant. Hardest part is working out whether to start...
It's a bit worrying how dependant we are on it. All the time I have put in to the templates and stock lists etc.
I have at least managed to get a screen print of the calendar so I can see what's going on with todays requisitions.
We are in the fortunate position of having a few quid to spend on new equipment and I am looking at getting some LED rayboxes.
Has anybody tried these from select school supplies? SSS rayboxes
They are cheap for a class set but I am very wary of the old adage of buy cheap buy twice and...
I found this video quite helpful. https://www.saps.org.uk/secondary/teaching-resources/235-student-sheet-23-photosynthesis-using-algae-wrapped-in-jelly-balls
Not that we ever got to use the algae as it died over lockdown.
You can buy a starter culture from blades biological.
I would make up a what you think is a 1M solution of ammonia from your old stock bottle and then titrate it with 1M HCl.
At least that will give you a rough idea of the strength of your stock bottle.
Google suggests methyl orange as the indicator.