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tresset_1 [31]
2 years ago
5

What is the molar concentration of [H3O+] in a cola that has a pH of 3.120?

Chemistry
1 answer:
ELEN [110]2 years ago
8 0

Answer:

  • [H₃O⁺] = 7.586×10⁻⁴ M

Explanation:

The <em>pH</em> of a solution is a measure of the <em>molar concentration of </em><em>H₃O⁺</em> ions in the solution.

The mathematical expresssion that states the relation between the molar concentration of H₃O⁺ ions and the pH of the solution is:

  • pH = - log [H₃O⁺].

This is pH is numerically equal to the negative decimal logarithm of the  molar concentration of H₃O⁺.

The square brackets are used to indicate molar concentration.

Thus:

  • pH = - log [H₃O⁺] ← equation
  • 3.120 = -log [H₃O⁺] ← substituting values
  • - 3.120 = log [H₃O⁺] ← product property of the multiplication
  • 10^{- 3.120}=[H_3O^+] ← antilogarithm property
  • [H₃O⁺] = 7.586×10⁻⁴ M ← result
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