One way to remove lead ion from water is to add a source of iodide ion so that lead iodide will precipitate out of solution: Pb2+(aq) + 2I−(aq) → PbI2(s)

(a) What volume of a 1.0 M KI solution must be added to 120.0 mL of a solution that is 0.23 M in Pb2+ ion to precipitate all the lead ion?

L I−

(b) What mass of PbI2 should precipitate?

g PbI2

(Please show how to work it out step by step)

b. th3 n4zc4 pl4t3 15 c0nv3rg1ng w1th the s0uth 4m3ric4n pl4t3.

1 is the answer to this problem

ca has a crystalline lattice with positive ions (since it is a metal, metals are positively charged) and electrons flow freely in its structure since the ca atoms have a large nuclear radius so the electrons are not tightly held, therefore the electrons can flow freely since they are not being highly attracted by the nucleus. moreover, one of the properties of metals are that they are conductors of electricity, thus proving ca is the element.