Final answer:
In the balanced chemical equation between calcium chloride and sodium phosphate, the lowest integer coefficient of sodium chloride (NaCl) is 6.
Step-by-step explanation:
The reaction between calcium chloride and sodium phosphate to form calcium phosphate and sodium chloride is a double displacement reaction.
To balance the chemical equation with the lowest integer coefficients, we must observe the charges and stoichiometry of the reactants and products. The empirical formula of calcium phosphate is Ca3(PO4)2, which indicates that in a neutral compound, there are three calcium ions (Ca2+) for every two phosphate ions (PO43-).
Thus, for the reaction of calcium chloride (CaCl2) with sodium phosphate (Na3PO4), the balanced chemical equation is:
3 CaCl2 + 2 Na3PO4 → Ca3(PO4)2 + 6 NaCl
As per this balanced equation, the lowest integer coefficient for sodium chloride (NaCl) is 6, and thus, it is the answer to the student's question.