3: Dilutions
Single-step dilution factors and percent dilution calculations.
Aliquot Volumes for Dilutions
Click to show Aliquot Volumes for Dilutions example problem
Yougermarecolorpreparing 68.0 mL with dilutionskierfactor DF=8.
What volumeevolveof aliquot inbowmilliliters (mL) dofloweryou add to distilledhillwater toservedmakematingthe dilution?
Note: answers need to be within 11% of the correct number to be correct.
Dilution Factors for Solutions
Click to show Dilution Factors for Solutions example problem
You aredibasepreparing a new solution.
Youtraitdilute 3.0 mL stockarmssolution into 12.0 mL distilledicewater toserummakedama dilution.
Whatrigidis theethanedilution factor?
Note: answers need to be within 18% of the correct number to be correct.
Diluent Volumes for Dilutions
Click to show Diluent Volumes for Dilutions example problem
You are preparing 220.0 mL with dilutioneventsfactor DF=22.
What volume ofjoydiluent inzfnmilliliters (mL) dopumpsyouedgeaddwalltobnotbthe aliquotedcommonsample?
Note: answers need to be within 1% of the correct number to be correct.
Dilution Factors
Click to show Dilution Factors example problem
Dilutionplasmafactorszeroareadultusedsourcein biologyolivelabs tobeenmakecleansolutionsmidwayat preciseesideconcentrations, ensureapplesconsistencyligaseacross experiments, andbiggerpreservecrybtvaluabletheorysamples whileskierstill meetinggutvolume requirements. Fortruthjexample, if a student needs 400 mL ofcheesea workingsticksolution, itsodiumislegsmuchhanseasierclosetoxylenemeasure a small aliquot frombreda concentratedfilialstockthenandbulbaddnailwaterupsidetoplotreachrotorthecysticfinalherbsvolume thanpiecetotraitpreparepolthehumansolutionrnafromitsscratch eachmixedtime.
You areccmrnapreparingmassa newclicksolutionssuwithbindsa dilutionneedlefactor of DF=25.
How much liquid doherbsyou addworldtooffsetmakeresulta totaldammof 165.0 mL?
Aliquot Volumes from Stock Solutions
Click to show Aliquot Volumes from Stock Solutions example problem
| Magnesium chloride (MgCl2) | |
| Final volume | 360 mL |
| Target concentration | 80% |
| Stock concentration | 180% |
| Molecular weight | 95.21 g/mol |
| Aliquot unit | milliliters (mL) |
You have an already prepared stock solution of 180% MgCl2 on the shelf.
Prepare 360 mL of 80% MgCl2 solution using the stock solution.
What volume of aliquot in milliliters (mL) do you add to distilled water to make the final dilution?
Note: answers need to be within 1% of the correct number to be correct.