{"id":2384,"date":"2015-06-30T15:47:28","date_gmt":"2015-06-30T19:47:28","guid":{"rendered":"http:\/\/www.ttgnet.com\/journal\/?p=2384"},"modified":"2015-06-30T16:07:31","modified_gmt":"2015-06-30T20:07:31","slug":"2384","status":"publish","type":"post","link":"https:\/\/www.ttgnet.com\/journal\/2015\/06\/30\/2384\/","title":{"rendered":"Tomorrow’s Post, but Today"},"content":{"rendered":"

11:30 –<\/span> I was making up nitrogen-free fertilizer stock solutions for biology kits yesterday when it struck me again as so odd that I’m using reagent-grade chemicals to make up fertilizer<\/em> solutions.
\n<\/span><\/p>\n

Each of the solutions contains macro- and\/or micro-nutrients. We have to supply them as three separate solutions because if you try combining them in the concentrations needed for stock solutions, you get a nasty precipitate.
\n<\/span><\/p>\n

So I made up 15 liters of Fertilizer A, enough for 120 kits at 125 mL\/kit. Fertilizer A is basically just a concentrated solution of monopotassium dihydrogen phosphate and dipotassium monohydrogen phosphate. (You use a specific mix of the two chemicals to maintain the proper pH.) Fertilizer A supplies potassium and phosphorus, both of which are macro-nutrients (The “PK” in “NPK”). That solution, as expected, turned out clear and water-white.
\n<\/span><\/p>\n

I went on to make up 2 liters of Fertilizer C, which provides calcium, cobalt, and boron ions. Again, that solution turned out clear and water-white.
\n<\/span><\/p>\n

Ah, but then I went on to make up 4 liters of Fertilizer B, again enough for about 120 kits at 30 mL per bottle, and provides magnesium, iron, copper, manganese, molybdenum, and zinc ions. What a mess. There’s not a precipitate per se<\/em>, but the solution is a cloudy brown. Cloudy enough that I don’t want to run it through my dispenser pump, which is a precision instrument. So I guess I’ll hand-fill 120 30 mL bottles. Better that than buy a new dispenser pump.
\n<\/span><\/p>\n

\n","protected":false},"excerpt":{"rendered":"

11:30 – I was making up nitrogen-free fertilizer stock solutions for biology kits yesterday when it struck me again as so odd that I’m using reagent-grade chemicals to make up fertilizer<\/em> solutions.\n<\/p>\n

Each of the solutions contains macro- and\/or micro-nutrients. We have to supply them as three separate solutions because if you try combining them in the concentrations needed for stock solutions, you get a nasty precipitate.\n<\/p>\n

So I made up 15 liters of Fertilizer A,<\/p>\n

 » Read more about: Tomorrow’s Post, but Today  »<\/a><\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[37,11],"tags":[],"class_list":["post-2384","post","type-post","status-publish","format-standard","hentry","category-lab-day","category-science-kits"],"_links":{"self":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/posts\/2384","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/comments?post=2384"}],"version-history":[{"count":0,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/posts\/2384\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/media?parent=2384"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/categories?post=2384"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.ttgnet.com\/journal\/wp-json\/wp\/v2\/tags?post=2384"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}