Question

Describe briefly how you prepare a 0.05mole/dm cube sodium carbonate solution in a 250cm cube volumetric flask

Answer 1

How many moles do you want? That's moles = M x L = 0.05 x 0.250 = 0.0125

grams Na2CO3 = mols x molar mass = 0.0125 x 106 = ? g
Weigh that amount of Na2CO3, place in a 250 cc volumetric flask, add some water, swirl until all of the solid has bas been dissolved, add distilled water to the mark on the flask, stopper, mix thoroughly, label. Done.