Question

Question #a64bf

Answer 1

Dissolve `8.0g` of `NaOH` in `100mL` water.

Explanation:

A "2-Molar Solution" is by definition 2 moles of a compound in 1 liter (`1000mL`) of solvent. For sodium hydroxide (`NaOH`) one mole is 40 grams. Two moles is then 80g. If you only want 100mL, you only need `(100"mL")/(1000mL) = 0.1` as much,
or `0.10 xx 80 = 8 grams` of `NaOH` in `100 mL` of water.

In practice, be sure that the final solution has cooled to 20'C for an accurate reading in a calibrated volumetric flask (or correct for the actual volume at constant temperature).