Enter your answer in the provided box. Lead(II) nitrate is added slowly to a solution that is 0.0400 M in Cl− ions. Calculate the concentration of Pb2+ ions (in mol / L) required to initiate the precipitation of PbCl2.

(Ksp for PbCl2 is 2.40 × 10−4.)

the concentration of Pb2+ ions is  

Explanation:

From the question we are told that

     The concentration of is

The reaction is  

The solubility constant for this reaction is mathematically represented as

Substituting values

explanation:

let the different atoms be x and y. each with four protons and same mass will be represented as follows.

mass number is number of protons + number of neutrons.

            and  

since, it is given that one has a negative charge while the other is neutral. therefore, there will be increase in number of protons and the atom will be represented as follows.

according to periodic table, mass number of beryllium is 9 and it has atomic number 4 so, the atoms will be and .  

the protons and neutrons will be located inside the nucleus whereas the electrons will be revolving around the nucleus.  

that tool would be a compass