Why does the pH of Coca-Cola change when you place limestone in it?

Answer 1

When limestone (calcium carbonate) is placed in Coca-Cola, a chemical reaction occurs between the acid in the soda (phosphoric acid) and the calcium carbonate. This reaction produces carbon dioxide gas, water, and calcium phosphate. As a result, the pH of the Coca-Cola increases, becoming less acidic due to the neutralization reaction between the acid and the base. The formation of calcium phosphate also contributes to the change in pH.

Answer 2

Oh, dude, it's like when you drop some limestone in Coke, it's gonna react with the acid in the soda and neutralize it. So, the pH changes because the limestone is basically like, "Hey, I got this, let me balance things out." It's like a little chemistry party happening in your glass, man.

Answer 3

Well, darling, when you add limestone to Coca-Cola, which is acidic, a chemical reaction occurs between the calcium carbonate in limestone and the phosphoric acid in the soda. This reaction neutralizes the acid, causing the pH of the Coca-Cola to increase. So, in simple terms, the limestone acts as a pH buffer, making your Coke a little less harsh on the ol' taste buds.

Answer 4

Why does the pH of coca-cola change when you place limestone in it?

Coke contains citric acid. The citric acid reacts with the limestone, producing calcium citrate and carbon dioxide (bubbles) and water. The equation below shows the carbonate ion bonding with the acid H on the front of the citrate ion. As the Acid H+1's are removed from the solution, the solution becomes less acid. The pH increases.

2H3C6H5O7 + 3CaCO3 = Ca3(C6H5O6)2 + 3H2CO3(CO2 + H2O)

Answer 5

The pH of Coca-Cola changes when limestone is placed in it because limestone is primarily composed of calcium carbonate, which is a base. When calcium carbonate reacts with the acid in Coca-Cola (carbonic acid), it helps neutralize the acidity, resulting in an increase in pH.