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_3O^+] [H_3O^+] = 10^pH As pH decreases, acidity increases. As pH increases, acidity decreases. Acidic solution: pH 7 Carbonated cola is more acidic than coffee or even orange juice because cola contains phosphoric acid What is the molar concentration of H_3O^+ in a cola that has a pH of 4.240? Express your answer with the appropriate units. Rank the following from most to least acidic. Rank from most to least acidic. To rank items as equivalent, overlap them.

Explanation / Answer

B)

pH = 4.240

Now use:

pH = - log [H3O+]

4.240 = -log [H3O+]

[H3O+] = 5.745*10^-5 M

Answer: 5.745*10^-5 M

C)

Lets convert all to pH:

[H3O+] = 10^-2 corresponds to pH = 2

[H3O+] = 10^-6 corresponds to pH = 6

other pH are 14, 3 and 5

The one with lower pH is more acidic

So, order from most to least acidic:

[H3O+] = 10^-2 pH = 3 pH =5 [H3O+] = 10^-6 pH = 14

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