Asked by Chantelle

After calculating the mass of NaOH to make the approximate 0.2mol/L solution, why is it not crucial to weigh out an exact amount?
Answered by bobpursley
Can't you vary the volume of solution? Measuring out an amount of solute is much easier than measuring out a specific mass.
Answered by DrBob222
In addition to the answer by Bob Pursley, we also recognize that NaOH is not a pure substance (at least not for very long) as it pickes up CO2 and H2O from the atmosphere.
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