To calculate pH and use it as a measure of acidity. The pH expresses the molar c

Question

To calculate pH and use it as a measure of acidity. The pH expresses the molar concentration of hydronium ions in an aqueous solution on a logarithmic scale. pH = -log[H_2O^+] [H_3O^+] = 10^-pH As pH decreases, acidity increases. As pH increases, acidity decreases. Acidic solution: pH 7 What is the pH of an aqueous solution with [H_2O^+] = 2 times 10^14 M? Express the pH numerically using one decimal place. Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid what is the molar concentration of H_2O^+ in a cola that has a pH of 3.120? Express your answer with the appropriate units.

Explanation / Answer

Part A.

Given [H3O+] = 2 x 1014

pH = - log [H3O+]

pH = - log [2x 1014]

      = 13.698

PH = 13.7

Part B.

PH of cola = 3.120

Molar concentration of [H3O+] in cola

  [H3O+] = 10PH

              = 103.120

              = 7.5 x 104M

Molar concentration of [H3O+] in cola = 7.5 x 104M

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