YOU SAID:

have you found the iron concentration for this lab yet?

INTO JAPANESE

このラボの鉄濃度はもうわかりましたか？

BACK INTO ENGLISH

Did you know the iron concentration in this lab?

INTO JAPANESE

このラボの鉄濃度をご存知ですか？

BACK INTO ENGLISH

Do you know the iron concentration in this lab?

INTO JAPANESE

このラボの鉄濃度を知っていますか？

BACK INTO ENGLISH

Do you know the iron concentration in this lab?