YOU SAID:

have we found the iron concentration yet?

INTO JAPANESE

鉄の濃度はもうわかりましたか？

BACK INTO ENGLISH

Did you know the iron concentration yet?

INTO JAPANESE

鉄の濃度はもう知っていましたか？

BACK INTO ENGLISH

Did you already know the concentration of iron?

INTO JAPANESE

鉄の濃度はもうご存知ですか？

BACK INTO ENGLISH

Do you already know the concentration of iron?

INTO JAPANESE

あなたはすでに鉄の濃度を知っていますか？

BACK INTO ENGLISH

Do you already know the concentration of iron?