Answer: answer is a) an attractive force that usually involves a polarly-bonded hydrogen atom and another polarly-bonded atom with a partial negative charge
Explanation: hydrogen bond is a special type of bonding that closely resembles an ionic bond. It involves hydrogen atom and another highly electronegative atom, this bond is due to the the attraction between the slight positive charge on the hydrogen and the slight negative charge on the pairing atom.
Note that electron is not transfered as in ionic bonding.
Molucules with hydrogen bonding between their atoms includes water, hydrogen fluoride and ammonia.
Answer is: the maximum concentration of Pb²⁺ is 6.8·10⁻³ M.
Chemical reaction 1: PbCl₂(s) → Pb²⁺(aq) + 2Cl⁻(aq).
Chemical reaction 2: NaCl(aq) → Na⁺(aq) + Cl⁻(aq).
Ksp(PbCl₂) = 1.7·10⁻⁵.
c(NaCl) = c(Cl⁻) = 0.0500 M.
Ksp(PbCl₂) = c(Pb²⁺) · c(Cl⁻)².
c(Pb²⁺) = Ksp(PbCl₂) ÷ c(Cl⁻)².
c(Pb²⁺) = 1.7·10⁻⁵ M³ ÷ (0.0500 M)².
c(Pb²⁺) = 0.000017 M³ ÷ 0.0025 M².
c(Pb²⁺) = 0.0068 M = 6.8·10⁻³ M.
Answer:
(1) Magnesium carbonate :-
![Q_{MgCO_3}=[Mg^{2+}][CO_3^{2-}]](https://tex.z-dn.net/?f=Q_%7BMgCO_3%7D%3D%5BMg%5E%7B2%2B%7D%5D%5BCO_3%5E%7B2-%7D%5D)
(2) Calcium phosphate :-
![Q_{Ca_3(PO_4)_2}=[Ca^{2+}^3][PO_4^{3-}^2]](https://tex.z-dn.net/?f=Q_%7BCa_3%28PO_4%29_2%7D%3D%5BCa%5E%7B2%2B%7D%5E3%5D%5BPO_4%5E%7B3-%7D%5E2%5D)
(3) Silver sulfide :-
![Q_{Ag_2S}=[Ag^{+}^2][S^{2-}]](https://tex.z-dn.net/?f=Q_%7BAg_2S%7D%3D%5BAg%5E%7B%2B%7D%5E2%5D%5BS%5E%7B2-%7D%5D)
Explanation:
(1) Magnesium carbonate will dissociate as:-
The expression for the ion-product is as follows:-
(2) Calcium phosphate will dissociate as:-
The expression for the ion-product is as follows:-
(3) Silver sulfide will dissociate as:-
The expression for the ion-product is as follows:-
