Heavy metal ions like lead(ii) can be precipitated from laboratory wastewater by adding sodium sulfide, na2s. will all the lead be removed from 14.0 ml of 6.30×10-3 m pb(no3)2 upon addition of 13.1 ml of 0.0121 m na2s? if all the lead is removed, how many moles of lead is this? if not, how many moles of pb remain?

All the 8.82*10^-5 moles of lead present is removed.

Explanation:

The total amount of lead II ion present is less than the amount of sulphide ion present and they react in 1:1 ratio so all the lead II ions are removed from the solution. See attached image.

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements