Highly unlikely as titanium is fairly expensive compared to steel and it is not a suitable material for blades.
Yes, there are titanium katanas, but they are not traditionally made for use in combat or martial arts. Titanium, being a strong and lightweight material, is sometimes used in the construction of novelty or decorative katanas for display or ceremonial purposes. Traditional katanas are made of steel.
Yes titanium does exist. Without titanium we wouldn't be able to travel to the moon or anywhere.
Kives and Dual Katanas
No
Since it is a pure metal, hence an element, it exists as atoms.
TiO3 does not exist. You may mean Dititanium trioxide, Ti2O3 which exists and is Titanium(III) oxide. an ionic formula fro this would be (Ti3+)2 (O2-)3.
How much black vampire katanas are worth depends on the age and the condition. Some are worth upwards of 1,000 dollars.
Muromachi Period (1392-1573)
The name may be be titanium(II) nitrate but I suppose that this compound doesn't exist.
The best way to find out the laws of owning any type of weapons, including Katanas, is to contact local law enforcement.
Katanas are typically folded around 8 to 16 times during the traditional forging process.
To determine the mass of titanium that will displace 0.75 ml of water, you can use the density of water and titanium. The density of water is approximately 1 g/ml. The density of titanium is about 4.5 g/cm³. First, convert 0.75 ml to grams using the density of water, then use the ratio of the densities to find the mass of titanium that will displace the same volume of water.