Standard Solutions, step by step
The standard procedure.
- Weigh accurately by differenceWeigh the boat, transfer, reweigh. The difference is what actually went in.
- Dissolve in a beakerIn less water than the final volume.
- Transfer with rinsingsRinse the beaker and stirring rod into the flask several times.
- Make up to the markDropwise at the end, bottom of the meniscus on the line.
- Stopper and invertAt least ten times, to mix thoroughly.
Why weigh by difference
- Some solid always sticks to the weighing boat
- Weighing before and after transfer accounts for it
- Weighing the boat empty afterwards is the same idea
Failing to rinse the beaker into the flask loses solute and lowers the concentration below the calculated value.
Questions about the Standard Solutions poster
- What’s on the Standard Solutions poster?
- 5 numbered steps, with a full worked run-through. The standard procedure. Weigh accurately by difference — Weigh the boat, transfer, reweigh. The difference is…; Dissolve in a beaker — In less water than the final volume.; Transfer with rinsings — Rinse the beaker and stirring rod into the flask several times.; Make up to the mark — Dropwise at the end, bottom of the meniscus on the line.; Stopper and invert — At least ten times, to mix thoroughly.. Failing to rinse the beaker into the flask loses solute and lowers the concentration below the calculated value.
- Who is the Standard Solutions poster for?
- Standard Solutions belongs to the Chemistry section rather than to a school year, because physical science is not something one grade owns. Anyone learning lab practice can pin it up — a beginner, a student mid-course, or someone revising years later.
- When should you use the Standard Solutions poster?
- Dissolve first, then make up to the mark. Never dissolve in the volumetric flask. A wall chart earns its place by being glanceable from where the work is happening, so Standard Solutions belongs on the wall where that physical science work actually happens, within glancing distance, rather than filed away.
- What other posters go with Standard Solutions?
- Apparatus, Calorimetry and Graphs in Chemistry sit alongside Standard Solutions in the Chemistry section. Printed together they make a wall rather than a single sheet, which is how a reference set actually gets used.ApparatusCalorimetryGraphs in Chemistry
- Is the Standard Solutions poster free to download and print?
- Yes. Standard Solutions downloads as a free PDF with no account, no email and no watermark, like everything else in the Chemistry section. Print as many copies as you like for a home, a classroom, a library or a tutoring group; reselling the file is the only thing the licence rules out.Read the licence
- What size does the Standard Solutions poster print at?
- Standard Solutions is a vector PDF laid out for US Letter, and prints on A4 with Fit to page — the same file, no separate download. Because every mark on it is drawn rather than photographed, it stays sharp enlarged to A3, A2 or A1 at a copy shop. Colour carries emphasis only, so a greyscale print of Standard Solutions loses nothing.Printing guide
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