What you are given
- Reagent (optional): NaCl
- Concentration: 0.05 M
- Final volume: 500 mL
- Molar mass (g/mol): 58.44
Formula: n = m/M ; c = n/V ; mass = c·V·M
Solutions
How do you calculate make a solution?
Weigh a solid or pipette a liquid: enter what you have, get the bench step. The relationship used is n = m/M ; c = n/V ; mass = c·V·M.
Worked example
Every number below is computed by the calculator, not typed in
The working
- Derive amount:
n = c · V=0.025 - Derive mass:
m = n · M=1.461
Weigh 1.461 g of NaCl, dissolve and fill to 500 mL.
What each symbol means
- n: amount of substance (mol)
- m: mass of pure substance (g)
- M: molar mass (g/mol)
A printable one-page version is on the formula sheet.
Try it yourself
Two problems, with the working revealed
Problem 1 Make a solution
Work out the result for make a solution.
- I am working with: Dilute a stock
- Solve for: Stock volume to pipette
- Reagent (optional): HCl
- Concentration: 0.5 M
- Final volume: 750 mL
- Stock concentration: 10 M
Show the answer and the working
Use 37.5 mL of the HCl and fill to 750 mL.
- Derive amount:
n = c · V=0.375 - Derive stock volume:
Vstock = c · V / Cstock=0.0375
Open this in the calculator to change the numbers.
Problem 2 Make a solution
Work out the result for make a solution.
- I am working with: Use a liquid reagent
- Reagent (optional): Ethanol
- Final volume: 10.5 mL
- Density (g/mL): 0.789
Show the answer and the working
That is 8.285 g of Ethanol.
- Derive mass:
m = ρ · V · 1000=8.2845
Open this in the calculator to change the numbers.
Do it with your own numbers.
The Make a solution calculator is free, shows every step, flags the hazards, and works offline once loaded. No account, no signup.
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