Salvaging mis-measured solutions. Adjusting mass &/or volume to still get the desired concentration
You can probably salvage that solution! How to adjust mass and/or volume to match what you have to still get the concentration you want.
Too much mass? Calculate volume
Measured mass/X = desired concentration
X = measured mass/desired concentration
Needed additional volume = X - current volume
Too much volume? Calculate mass
X/current volume = desired concentration
X = desired concentration x current volume
Extra mass needed = X - current mass
Alternatively, calculate the mass you need to add directly (rather than first finding total then subtracting).
To do that…
Extra volume = current volume - intended volume
Extra mass needed = extra volume x desired concentration
If adding that mass will not appreciably change the final volume, just add it.
If adding that mass would change the final volume, calculate mass for a higher volume with enough wiggle room. Add the mass for that, then adjust the volume to that higher volume.
more on metric conversions: blog: https://bit.ly/metric_calcs ; YouTube: • Metric conversions & scientific notat...
more on sig figs (which I ignored in this video) here: http://bit.ly/significantfiguress & • Figuring out sig figs - working with ...
more on dimensional analysis: http://bit.ly/dimensionalanalysising & • Dimensional analysis (aka factor-labe...
more about concentrations: http://bit.ly/sciencestocksolutions ; YouTube: • Concentration - ways to report it (mo... & • Working with relative concentrations ...
and a couple cheat sheets for molecular weights: https://drive.google.com/file/d/1TqCR...
and concentrations: https://drive.google.com/file/d/1v7pf...
more lab-mathy things: https://thebumblingbiochemist.com/let... & https://www.youtube.com/playlist?list...
More on the ethanol solution making blog: https://bit.ly/ethanol_solution; YouTube: • Making 70% ethanol solutions (the rig...
And solution making in general: blog: https://bit.ly/ethanol_solution; YouTube: • Making 70% ethanol solutions (the rig...
more about all sorts of things: #365DaysOfScience All (with topics listed) 👉 http://bit.ly/2OllAB0 or search blog: http://thebumblingbiochemist.com
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