If 0.20 mol dm^-3 NaOH_(aq) was evaporated to yield 5.0g of solid NaOH, calculate the volume of NaOH _(aq) used. (Na = 23.0,O = 16:0; H = 1.00)

Award0001

2 years ago

C = m/vdm³
mole = rm/mm = 5/40 = 0.125
C = 0.2mol/dm³

0.2 = 0.125/v
v = 0.125/0.2 = 0.625dm³
1dm³ = 1000cm³
0.625dm³ = 0.625/1× 1000 = 625cm³✓

Tlay

2 years ago

in the workings here instead of writing0.125 they wrote 0.215