Question text pH expresses the molar concentration of hydronium ions in an aqueo

Question

Question text

pH expresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale. (Note that it is common to use the hydrogen ion, H+, to represent the hydronium ion, H3O+.)

pH = -log[H3O+]

[H3O+] = 10-pH

As pH decreases, acidity increases. As pH increases, acidity decreases.

Acidic solution: pH < 7
Neutral solution: pH = 7
Basic solution: pH > 7

What is the pH of an aqueous solution with the hydronium ion concentration : [H3O+] = 6.3 x 10-6M ?

Answer        Provide your answer to the tenth of a pH unit.

Buttermilk is the milk that remains after churning milk into butter . It a recipe calls for buttermilk, you can make a substitute by adding 1 tablespoon vinegar (dilute acetic acid) to 1 cup of milk. Buttermilk has a pH of 4.63.

What is the molar concentration of [H3O+] in buttermilk?

Answer        Provide your answer to three significant figures. Answer may be in long form or scientific notation. The form of 0.123 in scientific notation is 1.23e-1, where "e" represents "x10" and the number after the "e" is the exponent term.

Explanation / Answer

1)

The pH of an aqueous solution with the hydronium ion concentration: [H3O+] = 6.3 x 10-6M is:

Based on the question, the formula for calculation of this problem is: pH = log [H3O+]

= -log 6.3 x 10-6 = - (-6.79) = +6.79

Thus, the pH of the H3O+ is 6.7 or 1×10-7 (neutral).

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