Question

Taylor mixes two liquids together in a beaker. A solid forms at the bottom of the beaker, and the liquid changes from pink to blue. Which of the following is true about the properties of the products?
A. The total number of atoms of the products can be different from the total number of atoms in the reactants.

B. The mass of the products can be different from the mass of the reactants.

C. The volume of the products must be exactly the same as the volume of the reactants.

D. The pH of the products can be different from the pH of the reactants.

Answer 1

The answer is actually D. The pH of the products can be different from the pH of the reactants. Hope this helps :)

Answer 2

Answer: Option (D) is the correct answer.

Explanation:

According to the law of conservation of mass, mass of reactants will be equal to the mass of products that is, mass is conserved in a chemical reaction.

Also, in a chemical reaction total number of atoms on reactant side are equal to the total number of atoms on product side and vice versa.  

On the other hand, there might be change in volume in a chemical reaction.

Whereas in a chemical reaction it is possible that pH of products can be different from the pH of reactants.  

For example, $HCl + NaOH \rightarrow NaCl + H_{2}O$, so we can see that HCl is a strong acid and NaCl is not an acid so both of them will heva different pH.

Thus, we can conclude that true statement about the properties of the products is that the pH of the products can be different from the pH of the reactants.