No, sodium hydroxide is NaOH. It is a strong base made of sodium, hydrogen and oxygen. Sodium carbonates is Na2CO3. It is a weak base and is composed of sodium, carbon, and oxygen.
sodium hydroxide = NaOH By Atom to Atom Ratio: Na = sodium = 33.333% O = oxygen = 33.333% H = hydrogen = 33.333% but if you mean mass ratio, then Na =23g O = 16g H = 1g 23g+16g+1g=40g therfore...