Question #a64bf

1 Answer
Feb 4, 2018

Answer:

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).