how do you say "pure" in Chinese?

if you want to use pure to describe someone, it will be 純潔(traditional chinese) or 纯洁(simple chinese). pronounce "chún jié"

if you wan to describe things like water, it will be 純淨(trad chinese) or 純净(simple chinese). pronounce "chún jìng"

it depends on the context. It can be any of these:
純 = chun = pure, simple, innocent
清 = qing = pure, clear, clean
æ­£ = zheng = pure, honest, righteous

Depending on context. 清 is also possible. Qing. As in Qing dynasty.

純
it's like chwun.
the wun is like wonderful
2nd tone.

i thought chinese have no souls? according to South Park.