How much did one drop of HNO3 cause the pH of water to change?

One drop of HNO3 will cause the pH of water to change from 7 to 3

The pH of a solution is the negative logarithm of the hydrogen ion concentration of the solution.

At equilibrium, the pH of water = 7

The concentration of hydrogen ions is 10⁻⁷ M

If 0.1 mL (about one drop) of 1.0 M HNO3 is added to 100 mL of water: the volume of solution is 100.1 mL and the concentration of solution is calculated thus:

C₁V₁ = C₂V₂

C₂ = C₁V₁/V₂

C₂ = 0.1 * 1/100.1

C₂ = 9.99 * 10⁻⁴ M

Hydrogen ion concentration, [H⁺] = 9.99 * 10⁻⁴ M

pH = - log(9.99 * 10⁻⁴)

pH = 3

Therefore, one drop of HNO3 will cause the pH of water to change from 7 to 3

Learn more about pH at: link

-4

Explanation:

It went from a 7 to a 2 and 7-2 is 4, so it changed by 4 and it went down by 4.

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